312 GEO. H. HORN, M. D. 



and moderately long, four-jointed, first joint long; equal to the next two which 

 are gradually shorter, the fourth nearly as long as the first. Body globose oval, 

 very convex, perfectly contractile, winged, the under wings well developed, 

 long and ciliate. 



In addition to the above characters it will be noticed that the gula 

 is obtusely carinate at middle, and with a shallow fovea on each side 

 for the lodgment of the club of the antennae, the elytra are not mar- 

 gined at the sides and the epipleurae are not distinct. 



The foregoing description is unusually long from the fact that all 

 preceding authors fail to mention characters which seem of great 

 importance, in view of the system of classification adopted in the 

 preceding pages. The entire structure of Clambus indicates the 

 propriety of retaining it in the present family, although it possesses 

 certain characters at variance with the general structure, while some 

 of the structures here are already foreshadowed in Agathidium and 

 Aglyptus. These genera with Empelus in the present tribe connect 

 Clambus with the general mass of the family. 



Erichson held the opinion that these insects should be placed 

 among the Coccinellidae, while other authors have seen resemblances 

 to the Trichopterygidae. The first idea seems to have no substantial 

 foundation while the latter has more in its favor,* yet the resemblances 

 are too few and the points of divergence so many that it may be 

 equally dismissed. 



Our species are three in number, as follows: 



Surface smooth, shining, glabrous, without punctuation or pubescence. 



gibbulus Lee. 

 Surface sparsely pubescent. 



Elytra posteriorly moderately densely finely punctulate...pubernlus Lee. 

 Elytra with obsolete, very sparse punctuation. 



Humeral angles of elytra rounded seminillllin n, sp. 



Humeral angles distinct vulneratus Lee. 



C gibbiilus Lee. — Globose-oval, piceous-black, shining, surface smooth 

 without j)unctuation or pubescence. Thorax more than twice as wide as long, 

 sides short strongly arcuate, apex sinuate each side, base strongly arcuate, hind 

 angles rounded, lateral margin more or less diaphanous Elytra very little 

 longer than wide, humeri rounded. Body beneath smooth with extremely 

 sparse pubescence. Legs and antennae testaceous. Length extended .04 inch ; 

 1 mm. (PI. VII, fig. 18). 



I have not observed any special sexual diiferences except that certain 

 specimens seem to have the anterior tarsi broader and are probably males. 



Occurs from Canada to Texas. 



*The under wings are ciliate with long hairs in a manner very similar to 

 that family. 



