Psocodea (Bark Lice, Book Lice, and Parasitic Lice)

Species in this group

Dypsocus tappanensis

Daily sighting probability ~10% · With luck

Cerastipsocus venosus

Daily sighting probability ~10% · With luck

Chilenocaecilius ornatipennis

Daily sighting probability ~10% · With luck

Polypsocus corruptus

Daily sighting probability ~10% · With luck

Graphopsocus cruciatus

Daily sighting probability ~10% · With luck

Stimulopalpus japonicus

Daily sighting probability <5% · Rare

Ectopsocus petersi

Daily sighting probability <5% · Rare

Ectopsocus briggsi

Daily sighting probability <5% · Rare

Daily sighting probability by month

Probability-weighted average across the group's species

<5%

Jan

~10%

Feb

~10%

Mar

<5%

Apr

<5%

May

~10%

Jun

<5%

Jul

<5%

Aug

~10%

Sep

~10%

Oct

~10%

Nov

<5%

Dec

When they're spotted

When the group's species are recorded (aggregated)

Where to see Bark Lice, Book Lice, and Parasitic Lice

Warmer areas are where this group is recorded most often. Our parks Our cities

Parks Ranked

#	Park	Country	Species	Daily sighting probability
1	Shenandoah National Park	🇺🇸 United States	3 of 8	~20%
	Corrupt Barklouse			~10%
	F-Winged Barklouse			~10%
	Tree Cattle			<5%
2	Great Smoky Mountains National Park	🇺🇸 United States	2 of 8	~10%
	Corrupt Barklouse			~10%
	Japanese Barklouse			<5%
3	Taroko National Park	🇹🇼 Taiwan	1 of 8	~10%
	Dypsocus tappanensis			~10%
4	Congaree National Park	🇺🇸 United States	1 of 8	~10%
	Tree Cattle			~10%
5	Pacific Rim National Park Reserve	🇨🇦 Canada	1 of 8	~10%
	Chilenocaecilius ornatipennis			~10%
6	Cévennes National Park	🇫🇷 France	2 of 8	~10%
	F-Winged Barklouse			<5%
	Peters' Barklouse			<5%
7	Redwood National Park	🇺🇸 United States	1 of 8	~10%
	Chilenocaecilius ornatipennis			~10%
8	Great Bear Rainforest	🇨🇦 Canada	1 of 8	~10%
	Chilenocaecilius ornatipennis			~10%
9	Snowdonia National Park	🇬🇧 United Kingdom	1 of 8	~10%
	Chilenocaecilius ornatipennis			~10%
10	Bavarian Forest National Park	🇩🇪 Germany	1 of 8	~10%
	F-Winged Barklouse			~10%
11	Pyrénées National Park	🇫🇷 France	1 of 8	<5%
	F-Winged Barklouse			<5%
12	Wadden Sea National Park	🇩🇪 Germany	1 of 8	<5%
	Ectopsocus briggsi			<5%

Cities Ranked

#	City	Country	Species	Daily sighting probability
1	Washington	🇺🇸 United States	4 of 8	~10%
	F-Winged Barklouse			~10%
	Corrupt Barklouse			<5%
	Japanese Barklouse			<5%
	Tree Cattle			<5%
2	London	🇬🇧 United Kingdom	3 of 8	~10%
	F-Winged Barklouse			~10%
	Peters' Barklouse			<5%
	Ectopsocus briggsi			<5%
3	Berlin	🇩🇪 Germany	2 of 8	~10%
	F-Winged Barklouse			~10%
	Peters' Barklouse			~10%
4	Paris	🇫🇷 France	3 of 8	~10%
	F-Winged Barklouse			~10%
	Peters' Barklouse			<5%
	Ectopsocus briggsi			<5%
5	Hamburg	🇩🇪 Germany	2 of 8	~10%
	Peters' Barklouse			~10%
	Ectopsocus briggsi			~10%
6	Boston	🇺🇸 United States	2 of 8	~10%
	F-Winged Barklouse			~10%
	Corrupt Barklouse			<5%
7	Brussels	🇧🇪 Belgium	2 of 8	~10%
	F-Winged Barklouse			~10%
	Peters' Barklouse			<5%
8	Seattle	🇺🇸 United States	2 of 8	~10%
	F-Winged Barklouse			~10%
	Chilenocaecilius ornatipennis			<5%
9	Vancouver	🇨🇦 Canada	2 of 8	~10%
	F-Winged Barklouse			~10%
	Corrupt Barklouse			<5%
10	Vienna	🇦🇹 Austria	2 of 8	~10%
	F-Winged Barklouse			<5%
	Peters' Barklouse			<5%
11	New York City	🇺🇸 United States	3 of 8	~10%
	F-Winged Barklouse			<5%
	Japanese Barklouse			<5%
	Corrupt Barklouse			<5%
12	Baltimore	🇺🇸 United States	2 of 8	~10%
	F-Winged Barklouse			<5%
	Tree Cattle			<5%
13	Copenhagen	🇩🇰 Denmark	2 of 8	~10%
	Peters' Barklouse			<5%
	F-Winged Barklouse			<5%
14	Bucharest	🇷🇴 Romania	1 of 8	~10%
	F-Winged Barklouse			~10%
15	Philadelphia	🇺🇸 United States	2 of 8	~10%
	F-Winged Barklouse			<5%
	Corrupt Barklouse			<5%
16	Miami	🇺🇸 United States	1 of 8	~10%
	Tree Cattle			~10%
17	Manchester	🇬🇧 United Kingdom	1 of 8	~10%
	Chilenocaecilius ornatipennis			~10%
18	Tel Aviv	🇮🇱 Israel	1 of 8	~10%
	F-Winged Barklouse			~10%
19	Kyiv	🇺🇦 Ukraine	1 of 8	~10%
	F-Winged Barklouse			~10%
20	Budapest	🇭🇺 Hungary	1 of 8	~10%
	F-Winged Barklouse			~10%
21	Toronto	🇨🇦 Canada	2 of 8	~10%
	F-Winged Barklouse			<5%
	Corrupt Barklouse			<5%
22	Istanbul	🇹🇷 Turkey	1 of 8	~10%
	F-Winged Barklouse			~10%
23	Warsaw	🇵🇱 Poland	1 of 8	~10%
	F-Winged Barklouse			~10%
24	Rome	🇮🇹 Italy	1 of 8	~10%
	F-Winged Barklouse			~10%
25	Portland	🇺🇸 United States	1 of 8	~10%
	F-Winged Barklouse			~10%
26	Tokyo	🇯🇵 Japan	2 of 8	<5%
	F-Winged Barklouse			<5%
	Japanese Barklouse			<5%
27	Leeds	🇬🇧 United Kingdom	1 of 8	<5%
	F-Winged Barklouse			<5%
28	Essen	🇩🇪 Germany	1 of 8	<5%
	F-Winged Barklouse			<5%
29	Birmingham	🇬🇧 United Kingdom	1 of 8	<5%
	F-Winged Barklouse			<5%
30	Helsinki	🇫🇮 Finland	1 of 8	<5%
	F-Winged Barklouse			<5%
31	Bogota	🇨🇴 Colombia	1 of 8	<5%
	Tree Cattle			<5%
32	Orlando	🇺🇸 United States	1 of 8	<5%
	Tree Cattle			<5%
33	Munich	🇩🇪 Germany	1 of 8	<5%
	F-Winged Barklouse			<5%
34	Houston	🇺🇸 United States	1 of 8	<5%
	Tree Cattle			<5%
35	Montreal	🇨🇦 Canada	1 of 8	<5%
	F-Winged Barklouse			<5%
36	Moscow	🇷🇺 Russia	1 of 8	<5%
	F-Winged Barklouse			<5%
37	San Diego	🇺🇸 United States	1 of 8	<5%
	Tree Cattle			<5%
38	San Francisco	🇺🇸 United States	1 of 8	<5%
	F-Winged Barklouse			<5%
39	Chicago	🇺🇸 United States	1 of 8	<5%
	F-Winged Barklouse			<5%

Bark Lice, Book Lice, and Parasitic Lice

Species in this group

Dypsocus tappanensis

Tree Cattle

Chilenocaecilius ornatipennis

Corrupt Barklouse

F-Winged Barklouse

Japanese Barklouse

Peters' Barklouse

Ectopsocus briggsi

Daily sighting probability by month

When they're spotted

Where to see Bark Lice, Book Lice, and Parasitic Lice

Parks Ranked

Cities Ranked