April, 1867.] 
241 
A MONOGRAPH OF THE BRITISH PSOCIDJE. 
BY R. m'lACHLAN, F.L.S. 
(Continued from p. 231.) 
5.— PSOCUS SEXPUNCTATUS, Liniic. 
Hemerohius Q-punctafus, Linn. Faun. Suec. p. 383, 1511 (1761) ; Syst. 
Nat. p. 913 ; Fab. Syst. Ent. p. 310, 9, &c. ; Miill. Prodr. p. 146, 1865. 
P. 6-punctatus, Lat. Coqb. Icon. 13, tab. 2, fig. 10 ; Burm. Handb. 2, 
p. 778, 8. P. suhfasciafus, Steph. 111. p. 119, 7 (1836) ; Hag. Ent. Ann. 
1861, p. 80, 18. P. maculatus, Stepb. 111. p. 119, 6 (1836). 
AntenncB scarcely so long as the wings, pilose in the male, fuscous, the basal 
portion yellowish. Head yellowish or fuscescent ; crown spotted with blackish (the 
spots varying in different individuals) ; nasus striped with blackish (when the head 
is fuscescent the spots and stripes of the crown and nasus are indistinct or confused 
with the ground colour ; they are always liable to vary) ; labrum dark. Thorax and 
abdomen varying from yellow to fuscous. Legs brownish, with the tarsi and apex 
of the tibiaj darker, often blackish. Wings hyaline ; anterior ^vings short and broad ; 
with fuscous clouds, some of them often uniting and forming an oblique fascia 
before the middle, broadest on the inner margin ; a series of six rounded fuscoua 
spots in the apex, placed in the cellules between the veins ; apical margin greyish ; 
pterostigma elongate, sub-triangular, rather narrow, enclosing a fuscous spot, and 
sometimes with the vein forming it marked with yellow ; veins blackish, with a dark 
spot placed at some of the points of furcation ; base of the superior apical furcation 
whitish. 
Length of body 1^"' ; expanse of fore-wmgs 4-4^ . 
Tolerably common. 
6. — Psocus BiFASCiATUs, LatreiUo. 
Psocus bifasciatus, Lat. Coqb. Icon. 11, tab. 2, fig. 4 (1799) ; Stepli. 
111. p. 120, 11 ; Burm. Handb. 2, p. 780, 15 ; Hag. Ent. Ann. 1861, 
p. 30, 19. P. cofitaminatus, Steph. 111. p. 120, 12 (1836). P. me^a- 
stigmus, Stepb. 111. p. 120, 13 (1836). 
Antennm not more than two-thirds the length of the wings, slightly pilose in 
S , black, sometimes testaceous at the base. Head ochreous ; crown with three 
groups of black spots, viz., one on each side close to the eyes, and the third behind 
the ocelli ; nasus with numerous straight longitudinal blackish lines placed very 
close together ; a large yellowish space beneath each eye. Thorax black above, 
with elevated radiating reddish-brown lines ; sometimes spotted with yellow be- 
neath. Abdomen blackish, the segments margined with yellow, more conspicuous 
beneath, and during life. Legs brown, with blackish tarsi. Wings hyaline ; anterior 
wings elongate, with fuscous markings, viz., a basal fascia broken up into spots 
(frequently absent altogether), an irregular indented fascia rather before the 
middle (usually well indicated), and a large spot placed in the sub-triangular 
pterostigma (always present), the latter is frequently filled in with yellow or 
