ENTOMOLOGICAL SECTION. 
25 
smaller spots posterior to these and directly behind the inner angle 
of the eye ; distinctly longer than the vertex and a little more than 
twice as wide as long, Scutellum of the same color as the prono- 
tum, with or without yellow and dusky markings, transverse suture 
very close to the hind margin of the pronotum. Elytra slightly 
exceeding the abdomen, pale cinereous, with a few dusky or black 
dashes within the cells, the heaviest one on the clavus near the suture, 
rather near the base. In some examples this is the only dark color- 
ation present. Tergum black on basal half, mostly yellow on the 
last two segments. Pectus and venter almost entirely black ; last 
ventral segment of the female black, short, distinctly inflated, pos- 
terior angles, produced and with a short, blunt median lobe ; ovi- 
positor yellow on the middle and basal portion, darker towards the 
tip, slightly exceeding the pygofers. Legs smoky yellow, femora 
and coxae mostly black. 
Male : With the valve large and broad, with a slight tooth at 
the apex ; plates stout at the base, suddenly constricted before the 
apex and exceeding the valve by nearly its own length. 
Fig. 2 . — Deltocephalus cookei : (a) female genitalia from beneath; (b) male genitalia from 
beneath. Greatly enlarged ^original). 
Fig. 3 . — Deltocephalus vanduzei : (a) genitalia of the male from beneath; (b) last ventral 
segment of the female from beneath. Greatly enlarged (original). 
Described from seven males and flve females taken at Manhat- 
tan, Colo., October 7th, by Prof. W. W. Cooke, to whom I take pleas- 
ure in dedicating this species. It is closely related io vanduzei G. & 
B., but is readily separated from the latter by the markings upon 
the vertex and the genital characters, as well as its usual lighter 
color. In venation this species is an Athysanus^ but the vertex and 
face, especially the latter, are Deltocephaloid in form. [See flgs. 2 
and 3.] 
