Lawson: Genus Acinopterus. 127 



In the collection of the Colorado Agricultural College are other 

 specimens from the same localities. 



Remarks. The specimens at hand show gradual gradations into 

 the variegated form of viridis, which, in its turn, goes by insensible 

 gradations into the pure green form characteristic of the species. An 

 examination of the male internal genitalia of typical variegatus and 

 that of a variegated viridis showed no differences, and the gradual 

 loss of the tegminal markings into the plain green form would seem 

 to indicate the identity of these two green forms. 



Acinopterus obtutus n. sp. 



(PI. VIII, fig. 9; pi. X, fig. 5; pi. XII, fig.s. 3, 4.) 



A rather small green species with a relatively larger vertex than viridis. 

 Length. 5.5 mm. 



Form. Head di.stinctl.>- narrower than pronotiim. Vertex large, about twice 

 as wide as long, one-half longer at the middle than next the eye, a sHght de- 

 pression just behind the broadly rounded apex which rounds very obtusely with 

 the front. All the sclerites of the face rather broad. Pronotum over twice as 

 wide as long, the anterior margin more curved than the posterior, the lateral 

 and humeral margins about equal, the transverse wrinkles of the disc indis- 

 tinct. Scutellum with the usual granulated surface and transverse impressed 

 line. Tegmina with the tips broken off in all three of the specimens from 

 which the species is described, but presumably rather rounded apically, judging 

 from the material studied. Claval area with a few cross-veins between the 

 first and second anal veins. 



Color. Vertex, pronotum and scutellum green, the scutellum with basal 

 angles and three longitudinal lines, light. Tegmina milky green, the veins 

 light or dark green, and margined more or less with brown. Below the entire 

 insect is green. 



External genitalia. Male: Last ventral segment long, hiding the valve. 

 Plates long and narrow, nearly parallel-margined to the somewhat divergent 

 apices, which are exceeded by the bristly pygofers by about two-thirds the 

 length of the former. 



Internal male genitalia. Styles of the usual shape, the granular apical por- 

 tions quite expanded at the tip, which is either straight or slightly concave at 

 the end. Connective nearly round, the basal excision rather deep. Qildagus 

 differing from that of any member of the genus. The body is very wide 

 ba.sally, the heel cleft, then strongly narrowed to the base of the procesvses, of 

 which the basal pa'ir are short and slender while the distal one is quite long 

 and slender, the penis opening at the extreme fimbriate tip. 



Distribution. The three male specimens from which this species 

 is described are all from the collection of Mr. E. L. Dickerson and 

 were taken in the Sabino canyon of the St, Catalina mountains of 

 Arizona. 



Remarks. This species is decidedly smaller than the other green 

 species, and the cedagus is so characteristic that on this structure 



