458 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 53. 



Very few of the specimens exhibit the infuscation at the apex of 

 the hind femur, and marked variation occurs in the form of the pro- 

 podeal areas and the strength of the carinae. 



Genus BATHYTHRIX Foerster (Howard). 



Only two North American species have been referred to this genus. 

 These are B. meteori Howard, the genotype, and B. pijwplae Hov/ard. 

 It is worthy of note that both of these species have the clypeus 

 apically witn two nipple-hke teeth. In the genotype these structures 

 are widely separated and the clypeus between is deeply impressed, 

 while in pimplae they are close together and the clypeus is not 

 impressed. In the Japanese B. huwanae Viereck, which is appar- 

 ently properly placed in this genus, the clypeus lacks both teeth and 

 impression. The new species described below has the teeth, but lacks 

 the impression. In the new species the clypeal vestiture is less con- 

 spicuous than indicated in Foerster's characterization of the genus, 

 and this character must be considered of doubtful generic value. 



Key to North American Species. 



General color blackish and rufoua; tergitea 2 to 4 longitudinally aciculate at 

 base; clypeus impressed in apical middle, the impression flanked on either 

 side by a nipple-like tooth, the teeth widely separated; hind tibiae uni- 

 formly rufous; ovipositor less than half as long as abdomen. .Tne^eon Howard. 



Black; tergites 2 to 4 not aciculate at base; clypeus not apically impressed, the 



two teeth very close together or wanting 1. 



1. Clypeus without a protruding brush of long hairs, the hairs appressed; mandibles, 

 scape below, and tcgulae whitish; nervulus slightly antefurcal; first tergite 

 in profile decurved and increasing gradually in thickness from base to apex, 

 the dorsal carinae rather weak, becoming obsolete far from the apex; hind 

 tibiae, tarsi, and second joint of trochanters black; ovipositor three-fourtha 

 as long as abdomen tibialis, new species. 



Clypeus with a protruding brush of long hairs arising near base; mandibles and 

 tegulae reddish piceous, scape immaculate below; first tergite in profile 

 thickest at spiracles, the dorsal carinae strong and reaching nearly to apex, 

 pimplae Howard. 



BATHYTHRIX TIBIALIS, new species. 



Female. — Length, 7 mm. ; ovipositor, 3 mm. Head polished, im- 

 punctate; face, cheeks, and malar space clothed with long, dense, 

 silvery pubescence, vertex and frons bare, clypeus bare except for a 

 few appressed hairs at base, its apex with two minute nipple-like 

 teeth placed close together; ocelli arranged in an approximately 

 equilateral triangle; malar space slightly less than twice as long as 

 basal width of mandibles; scape globose. Thorax polished, impunc- 

 tate, clothed like the head, the propodeum completely and distinctly 

 areolated, the areas practically smooth; nervellus broken far below 

 the middle and slightly antefui'cal; second intercubitus subobsolete. 



