J. R. MALLOCH 171 



Hydrophoria proxima sp. n. 



Male. — General color more intensely black than in dirisa, face l)lack; 

 abdomen with a broad dorso-central vitta, which is laterally distended on 

 anterior and posterior margins of each segment. 



Eyes more widely separated than in diinsa, the interfrontalia with a pair 

 of cruciate bristles; parafacial broader than in divLsn, cheek with fewer mar- 

 ginal bristles. Presutural acrostit^hals two-rowed. Mid femur with the 

 postero-ventral bristles not extending to base. 



Female. — Similar to the female of divisa, but darker in color, the til)iae 

 being usually black. 



The mid tibia has a strong antero-ventral bristle beyond middle, l)ut in 

 other respects the species are very similar. 



Length, 5.5 mm. 



Type.— d"; Machias, Maine, July 21, (C\ W. Johnson), [B. S. 

 N. H.]. Allotype.— 9 ; Princeton, Maine, July 12, 190!). Para- 

 types. — One male and one female, same data as allotype, and 

 same collector. Paratypes in collections of Illinois State Natural 

 History Survey and The American Entomological Society. 



Hydrophoria flavohalterata sp. n. 



Male. — ^This species shows an approach to those with the third tergite 

 tufted on latero-posterior angles, but the peculiar brownish or fuscous ixnicil 

 or tuft of stiff bristly hairs is absent, there being only a great(>r number of 

 erect bristles present than in uniformis and its allies. 



Eyes separated by at least the width across posterior ocelli; arista with 

 the longest hairs but little longer than its basal diameter. Third tergite 

 with strong bristles on latero-posterior angles; fifth sternite fringed along 

 the inner margins of jirocesses and with a few bristly hairs at or near apices. 

 Hind femur with bristles on basal half of postero-ventral surface; hind tibia 

 normally with three postero-dorsal bristles, the antero-ventral s\n'face with 

 four or five short bristles. 



Fennde. — 1 can not separate by any structural character the females of this 

 species from those of borealis. Both very closely resemble the female of 

 spinicauda, but are separable from it by the absence of presutural acrostichals. 

 Length, 5 to 6.25 mm. 



Type.~(^; Moscow, Idaho, May 5, 1912, [Coll. AldrichJ. 

 Allotype. — 9 ; same locality as type, June 6, 1912. Paratypes. — 

 Same locality as type, May 22, 1913, April 23, 1912, July 13, 

 1907, June 5, 1912; Kamiac Butte, Washington, June 1, 1912; 

 Lawyer's Canyon, Idaho, June 16, 1909; [all from the collection 

 of Dr. Aldrichj; Ihvaco, Washington, August 27, 1917. (\. L. 

 Melander). 



TK.\XS. .\M. ENT. SOe., XLVI. 



