1867.] 229 
h. Pterostigma united to the forked vein by a transverse veinlet ; 
neuration otherwise almost as in Fsocus Stenopsocus. 
B. Tarsi 3-joiuted ; neuration as in Civcilkos Elipsocus. 
Genus Psocus, Latreille (1794), Hagen. 
Fsochus, Latreille (1796). HemeroUus, p. Linne, Fabricius, Miiller, 
Sctrank, Scopoli, &c. Phryganea, p. Linue, Geoffroy. 
Tarsi 2-jointed, Pterostigma free. Discoidal cell complete, quad- 
rate. Four complete cellules on the apical half of the posterior 
margin. 
1. — Psocus LONGicoRNis, Pabricius. 
Hemerohius longicornis, Pab. Gen. Ins. p. 245 (1776), &c. P. longicor- 
nis, Pab. Ent. Syst. suppl. p. 203, 1 ; Zett. Insect. Lapp. col. 1052, 1 ; 
Eamb. Nev. p. 320, 3. P. lineatus, Lat. Coqb. Icon. p. 12, tab. 2, 
fig. 8 (1799) ; Steph. 111. p. 119, 8 ; Curt. B. E. 648, 5 ; Burm. Handb. 
vol. ii., p. 780, 18 ; Eamb. Nevrop. p. 219, 2 ; Brauer N. A. p. 34 ; 
Hag. Ent. Ann. 1861, p. 28, 15. 
AntenncB much longer than the wings, pubescent in the $ , black, the first, 
second, and third joints reddish-testaceous. Head yellowish-ochreous ; crown striped 
and spotted with black ; nasus regularly striped with longitudinal black lines. 
Talpi yellowish-ochreous, the terminal joint pubescent. Thorax fuscous or blackish, 
the divisions of the lobes margined with yellowish-ochreous. Abdomen yellow, the 
segments margined with black, which expands on the lateral margins, the terminal 
segments wholly black. Legs yellow ; tarsi and the apex of the tibiae blackish. 
Wings hyaline ; fore-wings rather elongate, with sub-triangular pterostigma, which 
is yellowish, with a fuscoiis spot in the apical portion ; at the base a sub-triangular 
fuscous spot proceeds from the inner margin half across the wing ; a more or less 
indistinct fuscous cloud in the apex (all these markings vary much in intensity) : 
veins blackish, all, excepting the costal nervure, yellowish at the base, that closing 
the discoidal cell, and the base of the supei'ior apical furcation, also yellowish. The 
male difiers considerably from the female ; the pterostigma being darker, almost 
filled in with piceous ; the other clouds and markings are often almost entirely 
wanting. Length of body* If -2i"' ; expanse of fore-wings 6-7"'. 
Tolerably common on tree-trunks, especially poplars. 
2. — Psocus NEBULOsus, Stephens. 
P. nehulosus, Steph. 111. p. 199, 9 ? (1836) ; Burm. Hand. vol. ii., p. 
780, 17 ; Hag. Ent. Ann. 1861, p. 29, 16. P. similis, Steph. 111. p. 120, 
20 (1836) ; Brauer JS". A. p. 33. P. variegatus. Curt. B. E. 648, 4, nee. 
Pab. P. Mi/««sc«'^««, Eamb. Nevrop. p. 319, 1, ? (1842). P. affinis, 
Eamb. Nevrop. p. 320, 4 ^ (1S42). 
* In all cases the measurements of the body are taken from dry examples; in the live insects they 
are considerably greater. The abdomen of the S shrinks much more than that of the ? . 
