ART. 28 REVISION OF DISONYCHA NORTH OF MEXICO BLAKE 63 



Scutellum dark. Elytra with dark sutural, median, and submar- 

 ginal vittae, the sutural and submarginal not joined at apex; 

 humeri not prominent, a short intrahumeral sulcus ; median dark vitta 

 with a slight ridging extending from below humerus the length of 

 the elytral vitta; surface finely alutaceous and finely punctate. 

 Body beneath finely pubescent; mesosternum, metasternum, and 

 abdomen except last segments dark ; base of femora, the tibiae, and 

 the tarsi darkened. Length, 5.8 mm; width, 3 mm. 



Type locality. — Colorado. (One paratype, a male, in collection of 

 U.S. National Museum.) 



Remarks. — Mr. Schaeffer has sent me 1 of his 3 specimens of D. 

 hrevicornis for examination and has donated it to the National 

 Museum (U.S.N.M. No. 44114). This species is most distinct and 

 unrelated to an}^ other north of Mexico. It does not belong to the 

 pensylvanica group, although it resembles that group in the dark 

 marking of the head and undersurface and the suggestion of an 

 elytral costa. The antennae are shorter than in that group, and 

 the prothorax is longer and more convex, without depressions or 

 callosities. The aedeagus is quite unlike any that I have seen in 

 any other Disonycha. 



The specimens bear simply the old label " Col.", and since their 

 source also is obscure, material from a more definite locality is needed 

 to corroborate the locality Colorado. 



32. DISONYCHA STENOSTICHA Schaeffer 



Plate 8, Figure 43 



Disonycha stenosticha Schaeffeb, Journ. New York Ent. Soc, vol. 39, p. 285, 

 1931 (Brownsville, Tex.; type in collection Charles Schaeffer). 



Description. — Large (7 mm) , broadly oblong, not depressed, shin- 

 ing, pale yellow, tip of mandibles, antennae, tarsi, and very narrow 

 sutural, median, and submarginal elytral vittae dark. Head pale 

 with tip of mandibles darkened; shining, smooth, only a few punc- 

 tures on each side about fovea; frontal tubercles not swollen; inter- 

 antennal area slightly produced, rounded; interocular space about 

 half width of head. Antennae extending about to middle of the 

 elytra, dark, with three basal joints paler; fourth joint longer than 

 third or fifth, and fifth longer than third. Prothorax about twice 

 as wide as long, convex, w^ithout callosities; sides slightly arcuate and 

 narrowed anteriorly; surface smooth, shining and nearly impunctate; 

 faint traces of four brownish spots, but no trace of median line. 

 Elytra broadly oblong, with humeri well marked, a short intra- 

 humeral sulcus within; surface smooth, shining, nearly impunctate; 

 elytral vittae very narrow, the submarginal vitta becoming indistinct 



