ART. 16 WASPS OF THE SUBFAMILY BEACONINAE MUESEBECK 9 



half the posterior basitarsus; apical segment of hind tarsi about as 

 long as the second tarsal segment; claws distinctly cleft; radius 

 arising from a little before middle of stigma; radial cell rather long, 

 but very narrow; second cubital cell subquadrate, narrowed above; 

 the second intercubitus usually strongly angled outwardly; medius 

 obsolescent basally; nervulus usually a little antefurcal; submediellan 

 cell very short, the first abscissa of mediella much shorter than the 

 second ; abdomen not longer than head and thorax combined, rather 

 narrow, somewhat compressed apically, entirely polished; ovipositor 

 sheaths distinctly exserted, but considerably shorter than the first 

 abdominal tergite. Color, uniformly ferruginous; antennae blackish; 

 legs concolorous with the body, the posterior tarsi more or less dusky; 

 wings hyaline. 



The above description is based on the following material, which is 

 in the United States National Museum: One specimen from Arizona 

 labeled ''Type No. 16221"; 4 specimens from Laredo, Texas; 1 from 

 Brownsville, Texas (C. H, T. Townsend) ; and 1 from Florence, Ari- 

 zona (C. B. Biederman). 



Genus BRACON Fabricius 



Bracon Fabricius, Syst. Piez., 1804, p. 102. Genotype. — Ichneumon desertor 

 Linnaeus (By designation of Curtis, Brit. Ent., 1825, No. 69). 



Cremnops Foerster, Verb, naturh. Ver. preuss. Rheinl., vol. 19, 1862, p. 246, 

 Genotype. — [Agathis deflagrator Nees (Monobasic) ] = Cremnops desertor (Lin- 

 naeus) . 



Phis genus has been discussed in detail by Morrison, ^ who has 

 included in his paper a revision of the Neartic species. It is there- 

 fore unnecessary to consider the group here further than to describe 

 a single species which was not included by Morrison. 



BRACON CRASSIFEMUR, new species 



At once distinguished by the broad posterior femora. In Morri- 

 son's key it falls nearest vulgaris (Cresson), because the antennal 

 scape is produced into a distinct tooth in front; but it can be easily 

 separated from vulgaris by the more robust form, the unusually 

 broad posterior femora, and the entirely black head and mesopleura. 



Male. — Length, 9 mm.; face long, rostriform; malar space fully as 

 long as the eye; face slightly impressed medially below the antennae; 

 frontal impression unusually strongly margined laterally; frons and 

 vertex polished; the lateral ocelU separated by a prominent polished 

 elevation ; ocell-ocular line fully twice the diameter of a lateral ocellus ; 

 antennae of type 45-segmented, of paratype 43-segmented; apex of 

 antennal scape produced into a conspicuous tooth inwardly in front, 

 this tooth more strongly developed than is usually true of vulgaris; 

 pronotal pits large and deep, distinctly separated; parapsidal furrows 



«Proc. U. S. Nat. Mus., vol. 52, 1917, pp. 305-343. 



3015—27 2 



