158 THE CANADIAN ENTOMOLOGIST. 



submarginal cells in each wing, and occasionally there are three of these 

 cells in one wing and only two in the other wing of the same specimen. 

 Thus every gradation between these two genera occurs, making it neces- 

 sary to unite them under the older name. 



From Exoprosopa proper I have separated those species in which 

 there are four submarginal cells in each wing, the third being divided into 

 two cells of nearly an equal size. I have examined numerous specimens 

 of this group from all parts of the world, and in every specimen of any 

 given species the number of submarginal cells in each wing is very con- 

 stant For the genus which shall contain these species I propose the 

 name Velocia (from velox, swift) ; the Anthrax cerberus Fabr. may be 

 regarded as the type of this new genus. 



My new genus, Ma?icia (from mancus, defective), although most 

 closely related to Anthrax, is sufficiently distinct ; its separation from 

 Anthrax is the more desirable as the latter genus already contains a great 

 many species. 



The following table contains all the genera of the Anthracina known 

 to occur in North America : 

 I — Pul villi pad-like, distinct ; wings usually with only two 



submarginal cells 2 



Pulvilli spine-like or wanting 3 



2 — Tip of antennae bearing a pencil of hairs Argyr amoeba 



Tip of antennae destitute of a pencil of hairs Hemipenthes 



3 — Style at tip of third antennal joint at least one-fourth as 

 long as that joint ; wings with three or four submar- 

 ginal cells 4 



Style at tip of third antennal joint minute or wanting ; 



wings usually with only two submarginal cells 5 



4 — Wings with only three submarginal cells Exoprosopa 



Wings with four submarginal cells, the third being di- 

 vided by a cross-vein into two cells of nearly an 



equal size Velocia 



5 — Axillary cell not longer than twice the distance between 

 tips of last two veins ; third basal cell widest at its 



apex Mancia 



Axillary cell much longer than twice the distance be- 

 tween tips of last two veins ; third basal cell not 

 widest at its apex Anthrax 



