440 U. S. NATIONAL MUSEUM BULLETIN 216 



Head and body distinctly flattened; apex of mandible with two 

 subequal teeth; frons without a median horn or tubercle; female 

 flagellum not apically specialized as in Xorides; epomia absent; hind 

 femur not thickened, without a tooth beneath; first abdominal seg- 

 ment depressed, its spiracle near its basal 0.3; second tergite without 

 oblique basal grooves; first and second tergites polished or with 

 various aciculation or fine wrinkling; apical part of ovipositor weakly 

 compressed, the ventral valve with about five ridges, basad of which 

 there is no roughened area. 



This is a Nearctic genus, with five species in our area and an unde- 

 scribed species in Mexico. We also have seen a specimen (9, Haines, 

 Oreg., July 10, 1931, M. W. Sanderson, in Lawrence collection) 

 which is either an additional species or a small, aberrant individual 

 of one of the species described below. We can neither be sure that it 

 is a distinct species nor assign it with confidence to one of the others. 



Keys to the species of Aplomerus north of Mexico 



MALES 



(The male of arugosus is unknown.) 



1. First abdominal tergite without median longitudinal carinae, 1.7 to 1.9 as 



long as wide, with moderately small, irregular punctures but not distinctly 

 striate; punctures on temple small, separated by about 2.5 their diameter. 



5. buprestivorus Rohwer 



First abdominal tergite with sharp median longitudinal carinae on its basal 



0.5 ±, more than 2.0 as long as wide, with strong longitudinal striae or 



wrinkling; punctures on temple coarse, separated by about 0.5 to 1.0 their 



diameter 2 



2. First abdominal tergite 2.2 to 3.0 as long as wide; wrinkling or striation of 



third tergite mostly transverse or oblique, covering usually less than the 

 basal 0.8 of the tergite; temple a little longer and less rounded. 



3. tibialis (Provancher) 



First abdominal tergite 3.2 to 3.9 as long as wide; wrinkling or striation of 



third tergite longitudinal, covering the basal 0.8 ± of the tergite; temple a 



little shorter and more rounded 3 



3. Longer hairs near upper edge of hind femur about 0.45 as long as depth of 



femur; front and middle coxae clear fulvous; punctures on temple separated 

 by about 0.7 their diameter; range: east of Rocky Mts. 



1. lineatulus (Say) 



Longer hairs near upper edge of hind femur about 0.25 as long as depth of 



femur; front and middle coxae more or less fuscous or black; punctures 



on temple separated by about 0.5 their diameter; range: west of Rocky 



Mts 2. robustus, new species 



FEMALES 



1. Third and fourth tergites completely covered with fine, sharp transverse 



striae 2 



Third and fourth tergites smooth, or sometimes partly covered with fine, 

 weak transverse striae 3 



