124 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



well as by night, usually late in the afternoon and at dusk. 

 Its note is a continuous, snapping z-z-z-z-z-z-z-z-z, not nearly 

 as loud as that of C. fusco-striatus of the South. 



The stridulations of Conocephalus ensinger Harris are in- 

 termittent notes tzip-tzip-tzip-tzip-tzip, rapidly repeated 

 for indefinite periods. I have found this Conocephalus very 

 common at Oxford, Massachusetts. Here it occurs in col- 

 onies in the tall grass in the wet meadows, and sings almost 

 entirely at night. The notes of a colony of these insects in- 

 termingle to produce a veritable din during the warm sum- 

 mer nights. 



I captured a number of individuals of Conocephalus inc.\i- 

 cauitsSaussure at Thompson's Mills, north Georgia, in the tall 

 grass of wet bottom lands. I have not heard the stridulations 

 of this species, which are said to be very loud. 



The locust Pyrgocoryp/ia uncinata Harris, which, in gen- 

 eral appearance, resembles Conocephalus, also occurs at 

 Thompson's Mills, although I have taken only a single male, 

 and know nothing concerning its stridulatious. 



The species of Conocephalus are almost strictly terrestrial, 

 although at Thompson's Mills, on one or two occasions, I have 

 traced the loud notes of some probable species to the crowns of 

 young pines. 



NEW GENERA AND SPECIES OF NORTH AMERICAN 



DIPTERA. 



BY D. W. COQUILLETT. 



Family ASILID^. 



Dasyllis semitecta, new species. 



Black, the tarsi brown, the pulvilli and bases of the claws yellow. 

 Hairs black, dorsum of abdominal segments two to six densely covered 

 with light yellow hairs, narrow apices of femora, both ends of tibias, and 

 whole of the tarsi with whitish hairs. Wings grayish hyaline, the veins 

 bordered with brown. 



Length, 19 mm. 



Winnipeg, Canada. A female specimen collected June 1, 

 1908, by Mr. J. B. Wallis. 



Type: No. 13089, U. S. National Museum. 



Family EMPIDID^. 



Clinocera genualis, new species. 



Female. Near binotata, but the entire face is silvery, the vein at the 

 base of the third posterior cell is curved and very oblique, etc. Black, 



