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humped and posteriorly bears at most a few short and incon- 

 spicuous hairs. Length 2-3 mm. 

 Hab. Ohio. U. S. A. (Koebele). 



P. stenocrani var. dubiosus var. nov. 



Like the typical form in structure but without the pale tips 

 to the antennae. 



Hab. Ohio, U. S. A. (Koebele). 



HAPLOGONATOPUS, gen. nov. 



Mandibles, maxillary and labial palpi, and the front legs prac- 

 tically as in the preceding genus, but the pronotum is very dif- 

 ferent, not being divided into a transverse anterior and elevated 

 posterior portion, being quite simply convex, and the head is 

 much more deeply concave. 



Synopsis of Species of HAPLOGONATOPUS. 



1. (4) Thorax for the most part dark-coloured or black. 



2. (3) Apical joint of the antennae and the mesonotum 



largely, pale H. apicalis. 



3. (2) Apical joint of the antennae and the mesonotum 



dark H. mocstus. 



4. (i) Thorax ferruginous or testaceous, at most a little 



infuscate H. americaniis. 



I. Haplogonatopus apicalis, sp. nov. 



Black or more or less pitchy, the face on its lower half, the two 

 basal, and sometimes the third antennal joint more or less, the 

 apical joint, and sometimes more or less of the preceding, the 

 mesonotum for the most part, and the legs (which are, however, 

 often largely brown), pale, yellow to testaceous. Pronotum and 

 propodeum posteriorly sometimes brown. 



Antennae with the third joint long and slender, about twice as 

 long as the second, the head above with scarcely visible sculp- 

 ture. Pronotum very smooth, shining; mesonotum conspicu- 

 ously pale; propodeum in front of the spiracles very finely trans- 

 versely rugulose, behind these smooth and shining, posteriorly 

 more or less distinctly transversely rugulose and without evident 



