18 U. S. NATIONAL MUSEUM BULLETIN 209 



plate approximately flat, covered below with long, dense, oblique 

 hairs, its apex truncate. 



Inner orbit with a yellowish stripe; forewing with a fuscous cloud 

 in the second and third cubital and second discoidal cells. Otherwise 

 colored like the female. 



Female: Forewing 10.5 to 13 mm. long; temple 0.4 as long as the 

 eye (about 0.7 as long as the eye in all other Nearctic species of the 

 group except C. heiligbrodtii) ; second flagellar segment 4.4 as long as 

 wide; propodeum with weak, coarse, transverse wrinkles; larger 

 punctures on sternites sparse and indistinct. 



Black. Wings orange, their extreme bases and the apical margin 

 of forewing fuscous. 



This species is atypical of the pyrrhomelas group and somewhat 

 transitional to the albopilosus group. An undescribed species from 

 Zacapu, Michoacan, Mexico (Evans and Berkeley), is a connecting 

 link between deceptus and more typical species of the pyrrhomelas 

 group. The male and female of deceptus are associated on slender 

 evidence and future studies may prove the association incorrect. 



Specimens: cT "Birkmann Coll." (Cambridge), cf, Florida (St. 

 Paul). 9, Bastrop County, Tex. (Townes). 9 (type), Fedor, Lee 

 County, Tex., June 1910 (Cambridge). 9, no data (College Station, 

 Tex.). 



4. Chirodatnus pyrrhomelas (Walker) 



Plate 1, figure 1 



Pompilus pyrrhomelas Walker, 1866, in Lord, The naturalist in Vancouver Island 



and British Columbia, vol. 2, p. 341, ? . Type: 9 , British Columbia 



(London). 

 Cryptocheilus rugosus Banks, 1917. Bull. Mus. Comp. Zool., vol. 61, p. 101, 9. 



Lectotype: 9, Wawawai, Wash., "9-8-08," W. M. Mann (Cambridge). 

 Cryptocheilus inaequalis Banks, 1917. Bull. Mus. Comp. Zool., vol. 61, p. 102, 



cf. Type: cT, Camp Umatilla, Wash. (Cambridge). 



Male: Forewing 12 to 17.5 mm. long; tooth on outer claw of fore- 

 tarsus about 0.35 as long as the part of the claw beyond it, the two 

 parts distinctly divergent; mesopleuron subshining, with close fine 

 punctures and with scattered larger punctures that are separated by 

 about 3.0 their diameter; abdomen rather strongly constricted between 

 the first and second tergites; apical margin of fifth sternite moderately 

 concave. 



Inner orbit with a yellowish stripe. Otherwise colored like the 

 female. 



Female: Forewing 14 to 22 mm. long; second flagellar segment 

 about 2.8 as long as wide; mesopleuron with the fine punctures ex- 

 tremely dense, a little denser than in the other Nearctic species of 

 the genus; coarser punctures of mesopleuron a little larger than in 

 the other Nearctic species of the genus; propodeum with coarse, ir- 



