312 GEO. H. HORN, M. D. 



the tibia). Hind tibise compressed cylindrical, hind femora not 

 toothed. Form oblong oval, feebly convex, elytra nearly covering 

 the pygidium. Eyes coarsely granulated. 



S. robin ise, Fab. Syst. El. ii., p. 397; Eat. Syst. i., 2, p. 370; Mantis, i., p. 

 41; Spec. Ins. i. p. 75. Ova), ferruginous, elytra with small black spots and 

 irregularly clothed with cinereous and ochreous pubescence. Antennae yel- 

 lowish testaceous, subserrate. Head ferruginous, punctured. Thorax nearly 

 semicircular in form, anteriorly truncate, base at middle truncate and on each 

 side bisinuate, a fine median line distinct only in basal half; color ferruginous 

 irregularly clouded with piceous, surface with coarse punctures sparsely placed, 

 and finer punctures and densely placed in the intervals; clothed with cinere- 

 ous and ochreous hairs. Elytra elongate oval, broadest at middle, apices 

 broadly rounded. Surface striate, striee punctured, intervals feebly convex 

 and densely punctulate ; color ferruginous, marked with black spots arranged 

 in five irregular transverse series; clothed with cinereous and ochreous hairs. 

 Body beneath darker than the upper surface and similarly clothed, with 

 sparsely placed coarse punctures, and fine punctures densely placed in the 

 intervals. Legs dark ferruginous. Length .30 inch ; 7.5 mm. 



Occurs in the Middle, Southern and Western States. This insect 

 in general aspect resembles some of our Cistelidse, notably Chromatid- 



Other species of the genus have at times been introduced, but their 

 existence is short, and none appear to have become acclimated, proba- 

 bly from lack of food peculiar to them. 



C1RYOBORUS, Schon. 

 Caryoborus, Schon., Curcul. i., p. 92. 



Prosternum entirely separating the coxae. Hind coxa? moderately 

 broad. Hind tibiae obliquely prolonged and not spinulose, finely 

 grooved on inner edge. Hind femora broad with a tooth and numer- 

 ous denticulations at tip and with the lower margin crenulate. Head 

 behind the eyes constricted. Lateral margin of thorax straight sub- 

 acute not deflexed in front, basal margin with a distinctly impressed 

 line close to and parallel with the entire margin. Elytra nearly c »n- 

 cealing the pygidium. 



The above characters seem worthy of fixing the generic value of 

 Caryoborus. The species certainly have a very different aspect from 

 the genuine Bruchus. 



Two species are known in our fauna. 

 Humeri muricately punctured; elytra ferruginous pubescence even ..Veseyi. 

 Humeri smooth ; elytra brownish, pubescence denser in spots... avIJiriticns. 



C. arthriticus. Fab. Syst. El. ii., p. 39S; ghditsias, Linn. Syst. Nat. i.. ii., 

 p 605; Oliv. Ent. iv., 79. p. 9, pi. 7, fig. 7. Elliptical, piceous, clothed with cinere- 

 ous pubescence more densely placed in small spaces. Head piceous, punctured, 



