46 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.64 



smoky hyaline, the apical third and a spot over crossveins brown, 

 penultimate section of fourth vein about one-third the last section 

 of fifth vein and only a little longer than posterior crossvein. Arista 

 yellow at the base, very finely pubescent. Length 2.5 mm. 



Hahitat.^St. Vincent. Major E. E. Austen has courteously fur- 

 nished the following additional information regarding the holotype 

 in the British Museum: cruciates absent, postverticals present, one 

 dorsocentral, middle tibiae with preapical, first vein bare, sections of 

 fourth vein about 3.5: 1: 6.5. Notwithstanding the approximation 

 of the crossveins the chaetotaxy places the species best m the genus 

 Soharocephala. 



74. SOBAROCEPHALA PLUMATA, new species. 



(Fig. 35) 



Female. — Front and occiput luteous, face and cheeks pale, mouth- 

 parts and antennae reddish yellow, the third antennal joint with a 

 dusky stripe on outer side at base of arista, the arista black and 

 densely short-plumose, twice the length of antennae, ocellar bristles 

 microscopic, cephalic bristles yellowish, four very delicate buccal 

 hairs. Thorax reddish yellow, with six blackish spots arranged in 

 pairs, one at lateral margin anterior to wing, one much smaller on 

 the same transverse line just outside the dorsocentral row, and a 

 third pair across the suture in front of the second pair; scutellum and 

 metanotmn black, pleurae luteous; bristles yellowish, prescutellars 

 scarcely differentiated. Legs yellowish, the front tarsi and adjoin- 

 ing half of tibiae dusky. Wings hyaline, cloudy on apical third and 

 with a slight clouding over posterior crossvein, costal ratio 4: 1.2, 

 fourth vein 1.4: 1: 3.2, fifth vein 2: 1; halteres whitish; calypteres 

 yellowish with bro\vnish border. Length 3.5 mm. 



Holotype. — Alhajuelo, Canal Zone, Panama, collected by August 

 Busck, in National Museum, Cat. No. 26276, U.S.N.M. 



75. SOBAROCEPHALA PLUMATELLA, new species. 



(Fig. 39.) 



Male. — Occiput and front ochraceous, face, cheeks, antennae and 

 mouthparts yellow, arista black, closely plumose on basal two-fifths, 

 remainder openly plumose, cephalic bristles ferruginous. Mesonotum 

 marked with a black vitta between the dorsocentral bristles, tapering 

 point behind the neck, laterally blackish, between these stripes 

 ivittate with chraceous; scutellum black, metanotum and pleurae 

 pale yellow, the metapleura black; thoracic bristles blackish. Abdo- 

 men black except the first segment, the sternites and the small 

 quadrate lamellae, a 1 of which parts are yellowish. Legs entirely 

 yellowish, flexor fringe of front femora with uniform short setae. 

 Wings subhyaline, gradually darker to tip, costal sections 3.6:1, of 



