July, '08] ENTOMOLOGICAL NEWS. 319 



This distinct little species is to be placed in our list between 

 ambigena and americainis. From the former it differs by hav- 

 ing only one subhumeral stria, the fifth dorsal stria short, api- 

 cal, and the outer thoracic stria absent; the possession of a 

 distinct subhumeral stria, and the rather depressed prosternum 

 with two short basal stria distinguishes davisi from ameri- 

 canus. The possession of prosternal striae would place this 

 species in Dr. Horn's group servus, but as these striae are 

 variable and absent in some specimens which is also found 

 occasionally in defectus and sen'us* and the mesosternum is 

 distinctly truncate I prefer to place it with americamis and 

 allies. 



Most of the specimens before me were collected by my 

 friend, Mr. William T. Davis, to whom this species is dedi- 

 cated. 



The number and size of the elytral and thoracic striae have 

 been used to distinguish a number of species. However, one 

 or the other of the elytral striae varies or may be entirely ab- 

 sent. I have a specimen of defectus Hakl. from Southern New 

 Jersey which has the fourth elytral stria not entire, but greatly 

 abbreviated behind ; another specimen which I collected in Lake- 

 hurst has the fourth elytral stria represented by a short basal 

 and apical stria. A specimen from New Jersey (O. Dietz), 

 belonging in Dr. Horn's americanus group, differs only from 

 the description of exaratns by having the surface distinctly 

 punctured. The punctuation in perple.vus is sometimes so fine 

 that it can be easily overlooked and the outer thoracic striae 

 are occasionally extremely short, which seems to show that 

 americamis, perple.vus and cxaratus are one variable species. 



Listrochelus tarsalis n. sp. 



Form of opacicollis Horn which it also resembles in the opaque and 

 pruinose upper surface. Head densely cribrately punctate and hairy ; 

 frontal suture obsolete ; clypeus transverse, feebly emarginate at mid- 

 dle, margin feebly reflexed. Thorax strongly transverse; sides angu- 

 lately rounded below middle ; margins coarsely crenulate and fim- 

 briate ; apical and basal angles rounded ; surface sparsely, obsoletely 

 punctate. Elytra sparsely but distinctly punctate, each puncture bear- 

 ing a moderately long hair; sutural costae feeble; discal costae absent. 



