8 Trans. Acad, of St. Louis 



over the vegetation near Creve Coeur Lake and near the 

 Meramec River at Moselle. One male specimen of S. 

 scaeva emerged from a cocoon of Sceliphron caementa- 

 rium on June 15. It was placed in a vial where, in a few 

 days, it broke up with its jaws much of the cork stopper. 

 It was then placed in a cage with sugar-water and fruit, 

 where it lived for twenty-five days. 



Priocnemis nehulosus Dahl. [S. A. Rohwer]. In a road 

 sparsely covered with grass, this Pompilid was actively 

 chasing a spider, but the wasp in her chase encountered 

 a spider's web in the grass; she paused in her quest and 

 spent several seconds searching it, and thus lost her 

 quarry. 



Priocnemis nothus Ores. [S. A. Rohwer]. One specimen 

 was taken on the sunny baseball field on September 17. 



Priocnemis nigripes Ores. [S. A. Rohwer]. We have 

 twice found this wasp out walking about on the ground, 

 once in an open field in St. Louis and again on the sandy 

 ground near the river front in Kansas. They moved 

 nervously, and were poking their heads enquiringly into 

 every crevice and under sticks and leaves. From this 

 conduct we judged they were foraging. 



Priocnemis pompilus Cress. [S. A. Rohwer]. Two in- 

 dividuals were seen foraging on a clay bank in St. Louis 

 on June 20, 1918. They were eagerly scrambling under 

 clods and nervously tumbling into crevices. After many 

 such adventures, one brought a small spider out of a 

 crevice. She carried it a short distance, explored about 

 the region for a few minutes, then returned to the spider. 

 This performance she repeated three times, then she 

 carried the spider into one of the crevices. Three quar- 

 ters of an hour elapsed and she did not reappear. 



Cryptocheilus unifasciatus Say. [S. A. Rohwer]. On 

 August 31, at Wickcs, Mo., this wasp was seen dragging 

 a large spider by the mandibles across a rough road and 

 over a grassy area, traveling witli ease and rapidity. 

 The spider was limp and apparently dead. 



