188 



though doubtless incorrectly, as mere varieties of his (7. hirticollis. 

 If one of these insects in question is to be taken for a genuine 

 species, and the other for a variety, C. Hentzii should be selected 

 for the type, having all the elytral spots complete and distinct ; 

 and C. rujiventris for a variety, with these spots nearly effaced. 

 If this view of the case be correct, we should expect to find, what 

 have never yet occurred, specimens intermediate between the 

 typical species and the variety, having the elytral spots larger 

 and more distinct than in C. rujiventris^ but not so fully devel- 

 oped as in C Hentzii. From a careful comparison of many 

 specimens of C. Hentzii and G. rujiventris together, I am in- 

 clined to think that both are genuine species. Independently of 

 their different colors, and of the size and form of the elytral spots, 

 they present other distinctive specific characters. The thorax of 

 G. Hentzii is more nearly quadrate, and is almost straight at the 

 sides ; that of G. rujiventris is more contracted before and be- 

 hind, and is rounded at the sides. The common punctures on 

 the wing-covers of the latter are much larger and more distinct 

 than those of G, Hentzii, while the subsutural row of ocellated 

 punctures, which is visible even to the naked eye on each wing- 

 cover of G. Hentzii, is obsolete or entirely wanting in G. rujiven- 

 tris. 



If diligently sought for, in the right season of the year, Gicin- 

 dela Hentzii may yet be found in other parts of the United States, 

 and especially on those hills of New England, where the rocks 

 appear in flat tabular masses above the surface of the soil. Its 

 discovery in these or other places would be interesting, and wor- 

 thy of being made known through some scientific journal. 



The color of the upper side of this insect is a very dark or 

 obscure bronzed brown. The upper lip is whitish, with one 

 small tooth on the edge. Each w^ing-cover is marked with yel- 

 lowish white spots in the following manner : on the shoulder and 

 on the tip a C-shaped spot with dilated extremities, the first often 

 interrupted on the margin ; across the middle an S-shaped band, 

 consisting of two crescents joined by their reversed tips ; on the 

 margin behind this band an oblong spot ; and near to the an- 

 terior end of the terminal C-spot a round spot. There is a row 

 of coppery punctures near the suture, and a shorter row near the 

 shoulder. The head is purphsh blue beneath ; the breast and 



