6 Trans. Acad, of St. Louis 



an enormous number of males of that species were out 

 at that time. The larvae of Cicindela were again abun- 

 dant, but I could see D. zella do naught but walk or fly 

 about the low stubble. 



Pseudomethoca canadinses Bike. [S. A. Rohwer.] This 

 pair of mutillids was found in copulo on June 28. They 

 were walking slowly along the clayey margin of a clover 

 field, the male riding the female. He, being much 

 smaller, covered only the rear half of her body. The body 

 of the female, at a point where the abdomen joins the 

 thorax, is narrowly contracted. At this point the male 

 grasped her firmly with his jaws in order to hold his 

 position. The real union lasted for only a very few 

 seconds. This momentary mating was repeated so many 

 times that I concluded that this was the normal method. 

 Many of them were to be seen among the new wheat 

 stubble in a field skirting the woods, where also Cicin- 

 dela holes were abundant. 



Dasymutilla acrohinata. [S. A. Rohwer]. One female 

 was taken July 3, on a path in the forest. 



Dasymutilla allardi Roh. [S. A. Rohwer]. This cow- 

 killer was seen on August 29, on a hard-packed baseball 

 diamond in a city lot. It was prowling about in the im- 

 mediate vicinity of several burrows of aculeate Hymen- 

 optera. 



Dasymutilla blawana Roh. [S. A. Rowher]. At Lake 

 View, Kansas, two females were found walking about in 

 a sandy area by the roadside, and lurking about a hole. 

 When we inserted a probe into this hole, one of these 

 wasps jumped out, but upon opening the burrow we 

 found nothing but a colony of red ants. At Creve Coeur 

 Lake, Mo., one specimen was taken on a sandy area where 

 bees and some Pompilid wasps were at work and where 

 Cici/ndela beetles abounded. 



Dasymutilla ferrugata Fabr. [S. A. Rohwer]. Some 

 half-dozen of these cow-killers were observed on the 

 sandy beach of the Kaw River at Lake View, Kansas, 



