272 BRUES. 



thicker than the posterior tarsi. Pleurse smooth, the metapleurse 

 behind densely clothed with backwardly directed pale hairs. Wings 

 hyaline, with a well-developed marginal fringe apically below; disc 

 with very minute hairs ; hind wing with two frenulum hooks. 



Type and numerous paratypes from Kartabo, British Guiana 

 (W. M. Wheeler). 



The color of the legs in this species varies as in Synopeas meridionalis, 

 but the variation is continuous and no color forms are distinguishable. 



Gastrotrypes caudatus sp. nov. 



9 . Length 2.5 mm., including the long stylate apical segment of 

 the abdomen which is nearly as long as the remainder of the body. 

 Black, the wings hyaline, the antennae and legs, including coxse, 

 brownish yellow; upperside of antennae, especially the apex of scape 

 and the club and the thickened parts of the femora infuscated. Head 

 seen from above twice as wide as thick, shining and almost smooth, 

 the occiput faintly transversely striate and separated from the vertex 

 by a distinct, very fine, raised line; lateral ocelli twice as far from the 

 median one as from the eye margin. Antennte 9-jointed, the scape 

 rather slender, more than half the length of the flagellum; pedicel 

 small, narrower and one-third shorter than the first flagellar joint; 

 first flagellar twice as long as thick, considerably longer than the third; 

 fourth minute, narrowed at base, about as long as wide; club 4-jointed, 

 first joint longest, twice as long as thick, following subequal, each 

 shorter and somewhat thicker than the first; malar space nearly as 

 long as the width of the eye. Mesonotum smooth and shining, with a 

 band of sparse appressed pale hairs on each side of the middle; parap- 

 sidal furrows entirely absent; behind with a transverse impression on 

 each side at the base of the scutellum, densely clothed with pale hairs. 

 Scutellum highly convex at the middle, obliquely sloped behind and 

 finely, densely punctate beneath a mat of woolly hair. Pro- and 

 mesopleurre smooth and highly polished, metapleura with backwardly 

 directed pale hairs. Propodeum angularly produced laterally and 

 medially with a tubercle which corresponds to a central impression on 

 the dorsal surface of the first abdominal segment. Body of abdomen 

 ovate, nearly as long as the head and thorax together, consisting of 

 four segments; first segment about as wide as long, much narrowed 

 basally, its posterior edge set into the base of the second; medially 

 with a quadrate impression and woolly laterally; second segment as 

 long as wide, broadest behind the middle; its basal margin produced 



