144 U. S. NATIONAL MUSEUM BULLETIN 2 1 6 part 3 



subspecies. Doubtless there are more subspecies in Eurasia, some 

 of which may already be described (as species). 



In both hemispheres are some closely related forms southward of 

 the stated range of inquisitorius , that may prove to be additional 

 subspecies when material from intervening localities is available. 

 One of these is the form of northern Japan and the Kurile Islands, 

 which Uchida in 1936 described as Habrocryptus assimilis form 

 yezoensis. In yezoensis, the punctures on the mesoscutum are strong- 

 er and denser, flagellar segments of male shorter, and cheek shorter 

 than in inquisitorius. There may be intergrading populations in 

 Kamchatka or the northern Kuriles, so this too may be a subspecies. 

 For the present we believe it to be a distinct species, which should 

 be called Ischnus yezoensis (Uchida), new status, new combination. 

 A second case is /. velutinus of Arizona. On the basis of available 

 specimens it seems to be a distinct species, but additional specimens 

 may show it to be a subspecies of inquisitorius. 



MALES 



(The male of the subspecies assimilis is unknown.) 



1. Range: Eurasia and Alaska; hind coxa entirely black or sometimes marked 



with white 2 



Range: North America; hind coxa usually more or less ferruginous but some- 

 times entirely black or black and white 3 



2. Hind femur largely or entirely ferruginous; front coxa black and yellow; range: 



northern and central Europe. . 5a. inquisitorius inquisitorius (Miiller) 



Hind femur black, its base more or less ferruginous; front coxa black; range: 



central Europe 5b. inquisitorius brachyurus (Gravenhorst) 



3. Mesoscutum mostly or entirely fulvous, often with the margin black and some- 



times with a median yellow spot; range: British Columbia to California 



and Utah 5e. inquisitorius atriceps (Cresson) 



Mesoscutum black, sometimes with a median yellow spot 4 



4. Mesosternum entirely black, without a white mark next to sternaulus; 



range: Rocky Mountains from Colorado northwards, Yukon, Alaska, and 

 eastward in Canadian zone to Ontario. 



5d. inquisitorius pectoralis, new subspecies 



Mesosternum partly white, at least with a white mark next to sternaulus; 



range: Atlantic Ocean to Rocky Mountains in Canadian and Transition 



zones 5f. inquisitorius atricollaris (Walsh) 



FEMALES 



1. Propodeum and hind coxa entirely black; range: Eurasia and Alaska ... 2 

 Propodeum and hind coxa largely or entirely ferruginous or fulvous; range: 



North America 4 



2. Scutellum with a white spot; fifth tergite ferruginous; second segment of hind 



tarsus pale yellow; range: northern and central Europe 



5a. inquisitorius inquisitorius (Miiller) 

 Scutellum entirely black; fifth tergite black 3 



