J. CHESTER BRADLEY 131 



? . Black; the logs except coxae, the first dorsal abdominal segment except 

 narrow apical band, and base of second dorsal and ventral segments fer- 

 ruginous; front coxae with a pale but not yellow apit^al spotin front; short 

 line within the eyes by the bases of the antennae, scape be- neath, and spots 

 on second segment, yellow (colonial buff), the edge of clypeus and mandibles 

 a more obscure reddish yellow, the latter darker toward apex. Wings slightly 

 infuscated. Length, 6.5 mm.; of paratype, 8 mm. 



Sculptured as in the male, except that the areola on the propodeum is a 

 little less triangular, the sides slightly convex. 



Habitat. — British Columbia: Carbonate, on the Coluin})ia 

 River, July 7 to 12, 1908, altitude 2600 feet, three males, two 

 females, (collected by the author). Nevada: one male, [Amer- 

 ican Entomological Society]. 



Types. — In Cornell University. Holotype, cf, no. 131.1; allo- 

 type, 9 , no. 131.2; paratype, 9 , no. 131.3. 



Another female from the same place and collected at the same 

 time as the type seems to b(>Iong to this species, but several 

 of the radiating carinae of the propodeum are suppressed. The 

 first dorsal segment is entirely ferruginous in this specimen. A 

 second male collected at the same time and place, unfortunately 

 has liei?n pinned directly through the areola of the propodeum, 

 but looks as though the condition of the areola had been almost 

 in the female just mentioned. In other respects the male is 

 typical. Another male, taken at the same time and place, agrees 

 entirely with these in color, l)ut the propodeal areola is precisely 

 as in trianguliferus. I can not at present look upon it other than 

 as a variant of shmoi, but it raises the question as to whether the 

 precise conformation of this areola is as significant in some of 

 the species of Alysson as has heretofore been supposed. The 

 female paratype is larger than the allotype, and the areola of 

 the propodeum less triangular. 



The transition from the radiating type of areola to that of tri- 

 anguliferus could very easily be affected by the suppression of 

 all but two of the radiating carinae. 



The type of this species gives the impression of being most 

 closely related to A . radiatus Fox. If, however, the severfil other 

 specimens mentioned alwve really belong to it, representing 

 slight variations in the propodeal areola, I am inclined to believe 

 that its closest relative is A. Irianguliferun. In fact it may very 

 well represent a northwestern race of that species. It also is 



TRANS. AM. ENT. SOC, XLVI. 



