226 GEORGE H. HORN, M. D. 



C;. iiiterinedia Jacohy, Biol. Cent.-Am. vi, pt. 1, Suppl. p. 207.— Oblong, 

 convex, piceous witli rarely u faint bronze lustre, legs yellowish testaceous. Au- 

 tenuse pale at base, outer joints piceous. Head sparsely punctate, clypeus a 

 little more closely : thorax nearly twice as wide as long, sides feebly arcuately 

 narrowing to the front, margin slightly irregular, angles not everted, disc convex, 

 sparsely indistinctly punctate. Elytra not closely punctate, punctures rather 

 fine at middle, coarser at sides, substriately arranged at apex with the intervals 

 convex. Body beneath piceous, slightly bronzed. Propleurfe smooth, without 

 punctures, metasternum at sides punctate. Abdomen piceo-testaccous, sparsely 

 punctate with a transverse row of short erect hairs at the middle of tlie first 

 three segments. Length .17 — .20 inch.; 4.5 — 5 mm. 



The male has the hist ventral segment truncate, transversely im- 

 pressed at middle, with a transverse row of short, stiff" bristles near 

 the apical border. In the female the last ventral segment has a 

 slight apical emai'gination. 



This species has such a deceptive resemblance to some of the forms 

 of Rliabdojjterus picipes, that I had placed them for a time with 

 that species. It may be known from that by the usual narrow pro- 

 sternum of Colaspis, as well as by the sexual characters. Mr. 

 Jacoby places this species in a new genus, Euphrytus, Biol. Cent.-Am. 

 vi, p. 124, but there seems no valid reason for separating our species 

 from Colaspis. 



Occurs in Arizona, Tucson (Wickham). 



KHABDOPTKRl'S Lef. 



This genus contains a number of species formerly placed in Co- 

 laspis, of which they possess all the essential structural characters, 

 except that the prosternum is broad and flat, not contracted between 

 the coxae. 



One species occurs in our fauna. 



R. pieipes Oliv., Eut, vi, p. 8S6, pi. ii. fig. 15: prsetexta Say. Journ. Acad, 

 iii, p. 442; ed. Lee. ii, p. 211. — Form oblong oval, convex, brown bronze, the 

 elytral margiu often jeneous. Antennse te-staceous, slightly darker externally. 

 Head coarsely sparsely punctate, usually with a median impressed line, clypeus 

 more closely punctate, a smooth space near the anteunal insertion. Thorax 

 nearly twi(te as wide as long, narrowed in front, sides strongly arcuate, hind 

 angles prominent, disc convex, variably punctate, but never closely. Elytra 

 coarsely, but not closely punctate, punctures irregular on the disc, substriate near 

 the' apex, surface usually with at least one smooth line indicating the position 

 of a third interval. Body beneath more or less green, abdomen brown, paler at 

 apex. Propleurse with a few coarse punctures, metasternum smooth, abdomen 

 sparsely punctate, the first three segments with a row of short erect hairs at 

 middle. Legs testaceous. Length .16 — .20 inch.; 4 — 5 mm. 



The male has the last ventral segment truncate, quite smooth and 



