46 



Proceedings of the Biological Society of Washington. 



Length: 3 mm. 



Type locality.— V\nmn\QYS Island, Md. August 10-17, 1912 (W. L. 

 McAtee). Allotype: Maryland, near Plummers Island, July 4, 1914 

 (W. L. McAtee). Type and allotype are in 

 collection of W. L. McAtee. 



Named in honor of the collector in recognition 

 of many favors received by the writer. 



The species bears a superficial resemblance to 

 pallidus Johannsen, whicli name was borne by 

 one of the specimens. Separable by the entirely 

 yellow legs and thorax, the diflerently colored 

 abdomen and form of the hypopygium. 



Fig. 1 



Metriocnetnus annuliventris n. sp. 



Male. — Yellow, slightly shining. Head yellow ; 

 scape of antennae glossy black-brown, flagellum 

 fuscous, yellow at base, plumes brown ; palpi 

 pale brown. Thoracic vittae, the greater part 

 of sternopleura, a spot in front of wing base on 

 pleura, and postnotum dark brown. Abdomen 

 yellow, apices and bases of the segments con- 

 spicuously marked with black-brown. Legs 

 yellow, mid and hind coxae brownish. 



Frontal tubercles absent ; antennae about 1.5 as long as head and 

 thorax combined ; palpi much longer than height of head. Pronotum 

 rather broad, continued to upper margin of mesonotum, the latter not 

 much produced anteriorly. Hypopygium with weak dorsal plate, the 



apical portion of lateral arm consisting of 

 two processes (Fig. 2). Legs slender, mid 

 and hind pairs with long hairs ; fore tarsi 

 without long hairs, basal joint about four- 

 fifths as long as fore tibiae. Third vein 

 extending to beyond beginning of curve 

 at apex of wing and but little further from 

 the apex than fourth vein at its apex ; 

 cubitus forking slightly beyond cross vein ; 

 surface hairs on wings rather dense. 

 Length : 4 mm. 



Type locality. — Stanford University, 

 Cal., March, 1906 (J. M. Aldrich). 



This species resembles^avt/rons Johann- 

 sen, but differs in having the apices of the 

 abdominal segments as well as their bases 

 blackened and in having the cubitus fork- 

 ing distal of the cross vein. 

 The present species belongs to the subgenus Brillia Kieifer, which is 

 distinguished from Metriocnemus sen. str. by the bifid apical hypopygial 



Fig. 2 



