AHT. 5 GENERIC REVISION OF THE FOSSORIAL WASPS PARKER 165 



Bloyrics Lepeletiehi, Hist. Nat., vol. 3, 1845, p. 53. — Parker, Proc. U. S. Nat. 



Mus.. vol. 52, 1917, p. 56. 

 Genotype: Bicyrtes (servilii Lepeletier) ventralis Say. Monobasic. 

 BemhiduJa BuBMEasTER, Bol. Acad. Cordova, vol. 1, 1874, p. 122. — Handlirsch, 



Sitz. Akad. Wissensch. Wien, Math.-Nat. CI., vol. 98, 1889, p. 473.— Kohl, 



Ann. des K. K. Naturhist. Hofmus., vol. 11, 1896, p. 442.— Daxla Torre, 



Cat. Hym., vol. 8, 1897, p. 494. 

 Genotyi)e : Monedula discisa Taschenberg. Designated by Parker in 1917. 



Members of this genus are distinguished from those of other 

 genera of the tribe by the peculiar form of the propodeum, whose 

 posterior surface is distinctly concave and whose posterior-lateral 

 angles (except in a single species) are extended, compressed, and 

 wedgelike. The anterior ocellus is reduce to a transverse, linear, 

 arcuate cicatrice and the eighth sternite of the male ends in three 

 points. 



Head wide as thorax; vertex on a level with the top of the eyes, 

 the middle part being slightly above this level ; anterior ocellus 

 completely reduced to a linear, transverse, arcuate cicatrice; inner 

 eye-margins somewhat divergent at the vertex; mandibles dentate; 

 clypeus broad and only moderately arched; labrum about as long 

 as broad at the base, its apex rounded, not emarginate; maxillary 

 palpus composed of six segments, labial of four; posterior surface 

 of propodeum concave, its posterior-lateral angles (except in a 

 single species) extended, compressed, and wedgelike; second cubital 

 cell strongly narrowed on the radial vein; pubescence always short, 

 practicalh=^ wanting on the abdomen; second sternite of male may 

 or may not bear a process; eighth sternite of male ending in three 

 spines; spatha of male genitalia as in Figure 40. 



KEY TO THE SPECIES OF BICYRTES 



1. Males (abdomen with 7 visible segments; antenna with 13 segments) 2. 



Females (abdomen with 6 visible segments; antenna with 12 segments) 22. 



. 2. Posterior coxa with tooth on inner distal margin fodiens. 



Posterior coxa without tooth 3. 



3. Middle femur with tooth at base below 4. 



Middle femur without tooth at ba.se below 5. 



4. Ultimate tergite black; fasciae on tergites narrow ventralis. 



Ultimate tergite maculated ; fasciae on tergites broader parata. 



5. Anterior tarsus greatly dilated ; segments broad and flat odontophora. 



Anterior tarsus normal ; segments not broad and flat 6. 



6. Fifth segment of the flagellum wider than any other segment; apical seg- 



ment of all tarsi wholly or in part black discisa. 



Fifth segment of flagellum not widened ; apical segment of tarsi other- 

 wise 7. 



7. Second sternite with distinct median process or tubercle tricolorata. 



Second sternite without process or tubercle 8. 



8. Mesopleura more or less conspicuously maculated 9. 



Mesopleura black 13. 



