98 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



temperature was up to 114 F. , with a ground temperature of 

 140 F. It seems to be entire!}' too hot for these ants, and i 

 found that during this period the time of their greatest activity 

 was iii the moruing and toward sunset. It is also noticeable 

 that the foragers are not very far from the nests on cloudy 

 days, and when a rain seems imminent the ants are clustered 

 within a few inches of the entrance to the nests." 



Mr. Hyslop presented some biological notes on 77ierez>a 

 egressa Coquillett. He said: 



"Ou May 24, 1901, a large white larva was found in a 

 wheat field south of the town of Pullman, Washington. 

 When found it had its head and first four anterior segments 

 inside of an elaterid larva. It had eaten a hole through the 

 third ventral thoracic segment and was feeding on the viscera 

 of the elaterid. 



"Description Larva. The larva is cylindrical, 25 mm. in 

 length and 1 mm. in width. The color is glistening white 

 and semi-translucent, the brown contents of the alimentary 

 canal showing as a median dorsal stripe. The head is dark 

 brown and very small. 



"The larva continued to grow, feeding on one or two 

 elaterid larvae every day until June 10, when it pupated. 

 Just before pupating it measured 30 mm. in length and 1.7 

 mm. in width, the thoracic segments being much swollen. 



"Description Pupa. The pupa is white in color, with 

 brown shadings about the head and thorax. Measures 15 mm. 

 in length. Two large conical horns arise directly in front of 

 the eyes and are directed outward; two more similar but 

 smaller horns are situated on the anterior dorsal part of the 

 thorax near the sides. A large lateral spine is located on the 

 thorax and a row of post-stigmal spines are on the abdomen. 

 The abdomen is further ornamented by a transverse row of 

 smaller spines on each segment except the last two. The 

 terminal segment is provided with a pair of apical spines. 



"On June 24, 1909, a female therevid emerged from this 

 pupa and was determined by Mr. D. W. Coquillett as Thereva 

 egress a Coq." 



