344 THE CANADIAN ENTOMOLOGIST. 



ones against the eyes, just within the posterior angles, and an oblique dash 

 on either side the disc, black. Pronotum olive, becoming yellowish 

 anteriorly, a pair of elongate spots on the anterior margin just within the 

 eyes ; an approximate pair of round ones just back of these, and an oblique 

 dash on either side of the disc, before the middle, in line with the inner 

 margin of the eyes, black. Scutellum pale yellow, a large black triangle 

 well within the lateral angles. Elytra pale green, nervures slightly lighter. 

 Front olive fuscous, a few short arcs and a median stripe, which includes 

 the clypeus, light. 



Genitalia : ultimate ventral segment of female about half longer than 

 penultimate; lateral angles slightly rounding, the posterior margin elevated 

 in the middle, and sometimes slightly obtusely toothed; male valve large, 

 very obtusely angulate, plates stout, convexly rounding to a blunt tip, 

 fringed with stout spines. 



Described from numerous specimens from Orizaba, Yautepec, and 

 other Mexican points. This species and the following are closely related 

 to colofius of Uhler, and belong to the nigrifrons group. This species 

 may be readily distinguished from any of the others by the heavy black 

 markings on the pronotum. 



Deltocephalus sononis, n. sp. — Form and general appearance of 

 nigrifrons nearly, longer and narrower than comatus, olive and fuscous, 

 with milky nervures and reflections. Length 3.25 mm., width less than i 

 mm. 



Vertex and pronotum similar to those of comaiiis, the eyes long and 

 narrow, enclosing over half of the pronotum. Elytra very long and 

 narrow, with a large appendix ; venation strong, two cross nervures, the 

 central anteapical cell very long, dumb-bell shaped but not divided, the 

 apical cell beyond this, small, curved, less than half of the size of the third 

 one. 



Colour : vertex a pale dirty yellow ; four black spots on the anterior 

 margin, the outer pair often larger than the others, farther from eyes than 

 from inner pair ; sometimes a fuscous dot against the eye and irregular 

 brownish markings on disc. Pronotum pale olive and yellowish, with 

 five luleous stripes ; scutellum with orange spots along the base. Elytra 

 subhyaline, the veins light, sometimes margined with fuscous. Face 

 brownish fuscous, with light arcs on the front, sometimes the lower part of 

 the face light, with the satures and a stripe on the clypeus fuscous. 



Genitalia : ultimate ventral segment of the female half longer than 



