Goleopterological Notices, VI. 447 



On attentive observation the structural differences among the 

 species of Conosoma, as for example between crassa and knoxi, 

 are, as before remarked, A'ery radical indeed, in spite of the gen- 

 eral constancy of external form. 



14. C. versicolor Csy.— Cont. Descr. and Syst. Col. N. A. II., p. 142 

 (Couuins). 



Moderatel}' stout, oval, strongh' convex, pale piceo-testaceous, 

 the elytra except toward base and at the apical margin blackish ; 

 abdomen blackish, paler at apex; integuments rather shining; 

 pubescence somewhat dense and fine, dark in color and not very 

 conspicuous. Head small, much less than one-half as wide as the 

 prothorax, the latter about one-half wider than long, with the 

 basal angles but feebly and gradually prominent posteriorly and 

 rather broadly rounded. Elytra much shorter than wide, equal in 

 length to the prothorax, distinctly narrowed behind from the 

 base, the sides evidently arcuate ; disk with somewhat sparse 

 punctures having lineiform appendages as in crassa. Abdominal 

 setffi long, black and conspicuous to the base. Length 1.9 mm. ; 

 width 1.3 mm. 



Pennsylvania (near Philadelphia). This species is allied to 

 crassa, but is evidently distinct. It is very much smaller than 

 any example of a verj' large series of crassa which I have before 

 me, and differs in antennal structure to a marked and perfectly 

 decisive degree, this organ being much more rapidh* and strongly 

 incrassate, the tenth joint not or scarcely longer than wide and 

 tlte eleventh A'ery much shorter than in crassa, where its elongate 

 form constitutes one of the principal distinctive features of the 

 species in both sexes. It differs, besides, in the much narrower 

 epistoma. It is still represented by the unique female type. 



In the original description of both this species and occulta, I 

 have obviousl}' underestimated the width of the prothorax in 

 terms of its length, the deception in relative proportion when 

 measured by the eye not having occurred to me at that time. 



15. C debilis n. sp. — Oval,^ strongly convex and slightly shining, dark 

 castaneous througliont, the legs and antennse paler; pubescence moderately 

 short and dense, rather dark in color; punctures scarcely visible. Head dis- 

 tinctly less than one-half as wide as the prothorax, the subulate fourth joint 

 of the maxillary palpi densely pubescent; antenna; rather short, about as long 

 as the head and prothorax, very gradually and only moderately incrassate, the 

 ninth joint slightly elongate, tenth as long as wde, the eleventh scarcely one- 



