ART. 5 GENERIC REVISION OF THE FOSSORIAL WASPS PARKER 47 



Genus STENIOLIA Say 



Figures 7, 8, 31 



Stetiiolia Say, Bost. Journ. Nat. Hist., vol. 1, 1837, p. 367. — Patton, Bull. 

 U. S. Geol. Surv., vol. 5, 1880, p. 364.— Handlirsch, Sitz. Akad. Wissensch. 

 Wien, Math.-Nat. CI., vol. 98, 1889, p. 504.— Kohl, Ann. dcs K. K. Naturhist. 

 Hofmus., vol. 11, 1896, p. 435.— Dalla Tohre, Cat. Hym., vol. 8, 1897, p. 

 501.— Pakker, Proc. U. S. Nat. Mus., vol. 52, 1917, p. 5. 



Genotype. — Bemhex longirostris Say (monobasic). 



The extraordinary length to which the maxillae are developed, 

 extending when at rest to the hind coxae, distinguishes members of 

 this genus from those of all related genera. The genus seems to be 

 confined to the mountainous regions of western North America and 

 to extend down through Central America to northern South America, 

 from which but a single species has been thus far reported. This was 

 taken in Ecuador. 



Head wide as thorax; eyes naked, their inner margins approxi- 

 mately parallel; ocelli not completely obliterated, placed in pits or 

 depressions; anterior ocellus somewhat elliptical vertically, the sides 

 of the pit elevated above the general surface of the frons; vertex 

 depressed slightly below the level of the top of the eyes; clypeus 

 somewhat arched, carina on dorsal median line continuous with 

 carina between antennae; mandibles dentate; maxillae extremely 

 long, reaching when at rest, the hind coxae; maxillary palpus com- 

 posed of three segments, labial of one; propodeum narrower than 

 thorax, its posterior lateral angle rounded ; middle femur of male 

 without modifications; eighth sternite ending in three spines and 

 bearing also a more or less well-developed discal spine; venation of 

 wings as in Figure 8; spatha of male genitalia as in Figure 31. 



KEY TO THE SPECIES OF STENIOLIA 



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



Females (abdomen with 6 visible segments, antenna with 12 segments) 12. 



2. Middle tibia dilated 3. 



Middle tibia not dilated 4. 



3. Abdominal maculations white obliqua. 



Abdominal maculations yellow tibialis. 



4. Apical segment of tarsi black uigripes. 



Apical segment of tarsi not black 5. 



5. Abdomen almost wholly yellow sulfurea. 



Abdomen black and yellow, or black and white 6. 



6. Clypeus yellow 7. 



Clypeus black or with pair of black spots (or black nasal area) more or 



less well developed 10. 



7. Femora, particularly the third pair of femora, black and ferruginous. 



longrostris. 

 Femora not black and ferruginous 8. 



