THE CANADIAN ENTOMOLOGIST. 99 



5. Antennae with two ring-joints 6. 



Antennae with three ring-joints 9- 



6. Antennae 12-jointed Metastenus, Walk. 



Antennae with 13 joints 7- 



7. Clypeus with a median tooth Hemitrichus, Thorns. 



Clypeus without a median tooth 8. 



8. Mandibles three-toothed ; abdomen basally maculate with 



yellow Dimachus, Thorns. 



Mandibles two-toothed ; abdomen without yellow at 



base ffemadas, new genus. 



9. Antenna? strongly clavate Flabritys, Thorns. 



Antennae not strongly clavate Dinarmus, Thorns. 



All of the genera are said to have 13-jointed antennae, with the 

 exceptions of Disema and Metastenus. In specimens of M. acanthocini, 

 Ashm., however, there are three ring-joints instead of two, making the 

 antennae 13-jointed, so that in the above table this species would run to 

 the genus Dinarmus. The first ring-joint is so small that it is easily 

 overlooked, as it was by Dr. Ashmead, and it is very likely that Walker 

 has made the same mistake in the original description of the genus. 



A NOTE ON THE HABITS OF APHILANTHOPS. 



BY C. N. AINSLIE, BUREAU OF ENTOMOLOGY, WASHINGTON, D. C. 



It has been for many years a matter of common knowledge that some 

 fossorial wasps store their nests with various sorts of insects which they 

 seize, carry away and place, in a disabled condition, in their egg-chambers 

 for food for their larvae when these emerge from the egg. A great number 

 of observations have been made bearing on this subject, but much still 

 remains to be learned. It is probable that the habits of the vast majority 

 of species are yet practically unknown, except in a very general way. The 

 following note may have interest, because it is believed nothing has been 

 recorded concerning ant-catching by wasps. 



Early in August, 1908, while marooned at Albuquerque, New Mexico, 

 waiting for delayed mail, I noticed one day beside a concrete walk that 

 bordered a vacant lot in that city a throng of large red ants which 

 resembled Pogonomyrmcx ouidentalis. The bunch was seething with ex- 

 citement, and stragglers were continually coming and going. As I watched 

 I noticed a small quadrate-headed wasp drop from the upper air to the 



March, 1909 



