472 M. W. R. de V. GRAHAM 



Psychophagoides crassicornis sp. n. 



(Text-fig. 310) 



<j>. Head and thorax bluish black ; gaster black, basal tergite and last tergite bluish-tinged. 

 Antennal scape testaceous, slightly darker at tip ; pedicellus fuscous, testaceous apically ; flagel- 

 lum brown. Mandibles brown. Coxae concolorous with the thorax ; femora mainly fuscous, 

 testaceous at tips ; trochanters partly fuscous ; rest of legs testaceous with tips of tarsi brown. 

 Tegulae black ; wings subhyaline, venation brown. Length 2-5 mm. Head only slightly 

 broader than the mesoscutum, in dorsal view about 2-15 times as broad as long, with temples 

 moderately convergent and about one quarter as long as eyes ; POL 1-7 OOL, ocelli in a 

 triangle of about 135 . Genae moderately buccate, malar space half the length of an eye. 

 Eyes separated by 1-4 times their length, inner orbits diverging very slightly ventrad. Breadth 

 of oral fossa about 2-15 malar space. Mandibles moderate-sized, their lower edge slightly 

 curved ; outer tooth acute, middle ones subobtuse, inner one truncate, in the left mandible 

 broadly so. Clypeus radiately strigose, the striae extending some way up the genae ; head 

 otherwise very finely reticulate ; vertex clothed with black bristly hairs. Antenna (Text-fig. 

 310) : scape about three quarters the length of an eye, about four times as long as broad, barely 

 reaching the median ocellus ; combined length of pedicellus and flagellum about equal to 

 breadth of head ; pedicellus (profile) about 1-5 times as long as broad, nearly as long as first 

 funicular segment ; anelli about three times as broad as long ; flagellum stout, subfusiform, 

 thickest at about the second funicular segment, thence tapering slightly distad, proximally 

 distinctly stouter than the pedicellus ; first funicular segment about 1 -2 times as long as broad, 

 second and third subquadrate, following segments slightly transverse ; clava about 2-3 times 

 as long as broad, about as long as 2-5 of the preceding funicular segments, with a small tuft of 

 micropilosity at the tip of its third segment ; sensilla short and thick, arranged in two rows on 

 each segment, a partial third row on the first segment. 



Thorax about 1-5 times as long as broad. Pronotum, mesoscutum and scutellum with black 

 bristly hairs. Pronotum very finely reticulate, with a narrow smooth line along its hind margin. 

 Mesoscutum about 1-75 times as broad as long, its reticulation slightly raised above the general 

 surface, very fine, except discally where it is slightly stronger and coarser. Scutellum as long 

 as the mesoscutum and about as broad as long, moderately convex ; frenum unusually long, 

 about one third the total length of the scutellum ; very finely reticulate, extremely finely on 

 disc, the frenum somewhat more coarsely. Dorsellum a convex transverse strip, about four 

 times as broad as long, finely reticulate. Propodeum about two fifths as long as the scutellum ; 

 median carina weak and irregular ; plicae indicated only by a pair of small depressions at the 

 base of the propodeum and by a pair of sharp carinae in the posterior third ; area between the 

 plicae obliquely strigose-reticulate, moderately shiny, that between plicae and spiracular sulci 

 longitudinally strigose-reticulate ; spiracular sulci distinct but shallow, with a number of fine 

 transverse ridges. Postspiracular sclerite finely reticulate. Mesosternum finely reticulate, 

 more coarsely at sides ; mesepisternum finely reticulate, the upper subtriangular area having 

 its dorsal half smooth ; mesepimeron rather coarsely reticulate. Legs rather short, femora 

 rather stout. Fore wing moderately broad ; costal cell about nine times as long as broad, 

 its upper surface bare, lower surface with a single complete row of hairs plus some scattered 

 hairs in the distal third ; parastigma somewhat thickened ; basal cell virtually bare, open 

 below except at apex ; basal vein pilose throughout ; speculum moderate-sized, on upper 

 surface of wing extending hardly beyond the beginning of the marginal vein, open below ; 

 marginal vein 1-9 times as long as the stigmal vein and i-i times as long as the postmarginal ; 

 stigmal vein nearly straight, stigma small, suboval, separated by nearly three times its height 

 from the costal edge of the wing ; fringe of apical margin of wing very short. 



Gastral petiole more than three times as broad as long. Gaster about as long as, but some- 

 what broader than, the thorax, 1-3 times as long as broad, slightly sunken dorsally and convex 

 ventrally ; basal tergite occupying rather less than one third of the whole, its hind margin 



