208 



U. S. NATIONAL MUSEUM BULLETIN 216 



PAET 3 



Figures 99, 100. — Localities: 99 (left), Trachysphyrus asymmetricus asymmetricus ; 100 



(right), T. a. mirabilis. 



scutelliim, tegula, subtegular ridge, hind corner of pronotum, more or 

 less of edges of pronotum, more or less of propleurum and mesoster- 

 num, mark on lower part of mesopleurum, legs, and abdomen, red, 

 the hind tibia and tarsus somewhat infuscate; wings fuscous. 



Specimens: cf , 79, Gulp Canyon, Anza State Park, San Diego Co., 

 Calif., Apr. 4, 1959, J. C. Hall and E. I. Schlinger (Davis and Townes). 



III. LABORATOR GROUP 



Hairs on head, thorax, and coxae short to moderately long; temple 

 smooth, with distinct punctures; frons strongly concave, with a pit 

 dorsolaterad of each antennal socket; epomia usually of moderate 

 length; basal carina of propodemn usually weak or absent (strong in 

 the European T. divisorius) ; front tarsus of female not widened; 

 areolet pentagonal, its front side short and its mesal side usually a 

 little longer than its outer side; second recurrent vein simply arched, 

 usually rather short; axillus vein weakly convergent to inner hind 

 margin of hind wing. 



This group is Holarctic. It contains the five Nearctic species 

 treated below (one of which is Holarctic) , the Palearctic Cryptus divi- 

 sorius Tschek 1872, Buathra rujiventris Cameron 1903, Bathy crisis 

 striaticollis Cameron 1903, and several undescribed species from Asia. 

 Trachysphyrus divisorius (Tschek) is a new combination. 



Although the group is usually easy to recognize, the only reliable 

 distinction between it and the Albitarsis group is the presence of pits 

 on the frons, and the distinctness of the pits is variable. It appears 

 that the character of the presence of pits and the grouping that results 

 from emphasizing it is only partially natural. Most species of the 



