2 COLEOPTERA CHLAMYDAE. 



wards and so held that the anterior edge of the thorax is 

 supported by the finger, then with a fine needle pry the head 

 out of the thoracic -cavity ; if the specimen is rightly held 

 the necessary pressure to accomplish this comes against the 

 forefinger and does not loosen the thorax, when the head 

 starts, the antennae come out and are easily spread, the 

 specimen with displayed antennae may be conveniently in- 

 dicated in the collection by a small square of colored paper. 



The characteristic hump and median sulcus of the thorax 

 presents great variety of shapes and sizes ; a common 

 feature is to have the thorax cut away behind, leaving the 

 upper edge more or less carinate ; this cutting away is spoken 

 of as being declivous behind, and in very many forms the 

 part next the sulcus and some of the hump anteriorly is 

 more or less colored or darkened so that the thorax appears 

 spotted. The base of the declivity runs around the hump 

 more or less plainly to the front and forms the basal sulcus. 

 The sculpture of the elytra (aside from the punctures) con- 

 sists primarily of four lines or costae, a sutural, median, 

 humeral and sublateral. From being entire, they vary to 

 wholly absent, but in a great majority of cases they are 

 more or less present, though broken or divided or varied 

 by humps, tubercles or ridges. The most constant and im- 

 portant appear to be the median and humeral, especially the 

 latter. The shape of the prosternum presents great differ- 

 ences and should be carefully compared. 



In the Entomologist for 1904, p. 198, Mr. Jacoby de- 

 scribes Chlamys seminigra. Mr. C. J. Gahan kindly writes 

 me that the type (in British Museum) is a female, Mr. 

 Jacoby speaks of other specimens in the Donckier col- 

 lection. These are before me, three cf's, seven 9 's, the 

 epistome of the c? is profoundly excavate while the head is 

 hardly enlarged beyond that of Chlamys, the species prob- 

 ably will have to go into a new genus, but for the present it 

 may be put with Pseudochlamys. 



Among the specimens in the second Jacoby collection 

 labelled nodosa Klug. from British Guiana, is a very fine 

 example of C. chevrolatii Fauv. It is larger than the nodosa, 



