4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



OCNAEA TRIVITTATA, new species 



Third vein forked at apex; on one side the fourth vein is incom- 

 plete, on the other it joins the third just beyond the middle of its last 

 section, making the first posterior cell petiolate. Coxae brownish, 

 femora irregularly brownish, .not very dark ; tibiae and tarsi yel- 

 low, apical half of last tarsal joint and the claws black; pulvilli 

 yellow. 



Male. — Head rather large, eyes with dense yellow pile; palpi and 

 proboscis very minute, not visible; antennae reddish brown, first 

 joint black above, third slender, longer than height of head, and 

 longer than front tibia. 



Thorax and abdomen with dense erect yellow pile, venter bare; 

 mesonotum yellow with three broad black stripes confluent behind, 

 rounded in front, the outer much abbreviated anteriorly; pleurae 

 brown, both spiracles white; scutellum brownish yellow; calypters 

 roughened, margin brownish yellow with pale fringe. 



Abdomen shining blackish brown, first four segments with whit- 

 ish hind margin of uniform width, that on first segment narrow, 

 on the following ones conspicuous, not widening laterally except at 

 extreme edge, where they include half the segment; they extend 

 across venter at the width which they assume at the edge. Fifth 

 segment with narrow pale hind border, sixth with only a lateral 

 pale spot. 



Wings small ; the cross vein in the first posterior cell is more than 

 its length beyond the discal; no indications of other unusual cross 

 veins. 



Length, 9.5 mm. 



Type.—MQl^^ U.S.N.M. No. 43480, collected by Dr. J. Bequaert 

 at Sangrelaya, Honduras, March 13, 1924, and presented by him to 

 the National Museum. 



Remarks. — Described from one male, the type. This is the only 

 species of Ocnaea with distinct thoracic stripes. 



Family DOLICHOPODIDAE 



COLLINELLULA, new genus 



Very minute. Posterior half of mesonotum depressed. Antemiae 

 minute, third joint rounded, with af)ical bare arista; first antennal 

 joint bare; head concave behind; proboscis and palpi small. Ocel- 

 lars large, proclinate, divergent, situated high up ; one outer vertical, 

 and one frontal near eye. Face narrow in female, the eyes almost 

 touching near epistoma ; in male the ej^es are contiguous below the 

 antennae to the mouth. Thorax with two rows of rather strong 

 acrostichals ; two dorsocentrals on each side near scutellum, the row 



