J. R. MALLOCH 297 



bristle; mid femur with three to five bristles on basal half of postero-ventral 

 surface; hind femur with six to eight widely spaced bristles on whole length 

 of antero-ventral surface and one to two about middle of postero-ventral; 

 hind tibia with two to three antero-ventral, seven to nine short antero-dorsal, 

 and two postero-dorsal bristles. Costal thorn short; outer cross-vein bent; 

 last sections of veins 3 and 4 subparallel. 



Female. — Differs from the male in having the eyes separated at vertex by 

 one-third the width of head, each orbit nearly one-half as wide as interfrontalia, 

 the latter with a pair of cruciate bristles, and the abdomen more abruptly 

 pointed at apex. Length, 4.5 to 6 mm. 



Type. — cf; Alamogordo, New Mexico, April 30, 1902, [A. 

 N. S. No. 6209]. Par city pes. —2 d', 2 9, topotypical, April 30, 

 May 5 and 15. 



This species resembles niralis Meigen, a European species, in 

 coloration, but differs in chaetotaxy of hind tibia and some other 

 characters. 



Hydrophoria divisa Meigen 



1826. Anlhomijia divisa Meigen, Sys. Besch., v. 99. 



Two males and three females, Berkeley Hills, Alameda County, 

 California, April 20, 1908; two females. Redwood Caiion, Alarin 

 County, Cahfornia, May 17, 1908. 



A European species which is widely distributed throughout 

 North America. 



Hydrophoria uniforims sp. n. 



Ma'e and female. — Black, almost glossy. Head black, frons, orbits, face, 

 and cheeks in both se.xes with silvery pruinescence, interfrontalia in female 

 appearing opaque black when seen from above; antennae and palpi black. 

 Dorsum of thorax with three broad black vittae. Abdomen with a slender 

 black (lorso-central stripe and black anterior and posterior margins to segments, 

 begs black. Wings clear, veins black. Calyptra white. Halteres yellow. 



Male. — Eyes separated by width of anterior ocellus; antennae shorter than 

 face, third joint one and one-half times as long as second; arista jilumose on 

 basal half, the longest hairs about equal in length to width of third antennal 

 joint; parafacials in profile about half as wide as third antennal joint, the 

 latter equal in width to height of cheek. Thorax with chaetotaxy as in 

 divisa Meigen, presutural acrostichals irregularly four-rowed, weak. Abdo- 

 men subcylindrical, tapered apically; fifth sternite deeph^ cleft centrally, the 

 processes with rather long woollj^ hairs along inner half, with longer, slender, 

 curled, bristly hairs on disc and at apex. Fore til)ia usualh' with two bristles, 

 a weak one on antero-dorsal surface and a strong one on posterior;'mid femur 

 with three to five slender bristles on basal half of postero-ventral surface; mid 

 til)ia with one antero-ventral, one antero-dorsal, three to four postero-donsal 



TRANS. AM. EXT. SOC, XLIV. 



