648 Mr. Edward Saunders on 



given me the constitution, in a general way, of this 

 assemblage in the Palasarctic Region. It is as follows : — 



FOSSORES. 



Mutilla : only a few males in an extensive genus. 



Scolia: $ of one species in a genus of about 20 species. 



Saj)y(ja: '^ of one or two species out of 8 or 10. 



Myzinc: % of one or two species out of 20 or oO. 



Pomjnius : both sexes of over 200 described species (pro- 

 bably many are synonymous). More than half the genus. 



Salins : many species, but less than half the genus. 



Ceropalcs: one species out of about 5. 



Pscudagcnia : one species out of 4 or 5. 



Astatus : nearly all the species of a small genus. 



Tachytes and Tachysphex : more than half the species in 

 each of these extensive genera. 



Larra : one species only. 



Goryto^ : a small section only of a genus mostly com- 

 posed of black and yellow wasp-like species. 



Entovioscricus : both species. 



Miniesa : not far from half of about 15 species. 



Spho: : many species of an extensive genus. 



AmmopJiila : many species of an extensive genus. 



Alyson (small genus): 2 or 3 species. 



Nysson (medium-sized genus) : a few species. 



Didineis: both species. 



Dinctus : 1 species only in genus. 



Miscophus: 3 species out of about 10. 



Anthophila. 



Prosopis : about 5 species out of GO or 70. 



Halictus: 8 or 10 out of 100 or more. 



Sphccodes * : some 20 species or so. Practically the 

 whole genus. 



Andrena : about 20 species out of 200 or more. 



Nomada * : nearly half a large genus. 



Osmia : a very few out of about 200. 



Dioxys* : most of the species (about 6 or 8). 



Phiarus* Pasites* Biastes* Ainmobatcs * : nearly all the 

 species in these small genera. 



The absence of species belonging to the formidable 

 Diploptera is remarkable. A brick-red colour is known 

 on the basal segment of the abdomen in several species 



* Geuera thus marked are known or suspected to bj imj^uiline. 



