416 PROCEEDINGS OF THE NATIONAL MUSEUM vol.94 



greatly broken up by an extensive medial cleft, short, strongly asym- 

 metrical; left hemitergite (10 L) large, dark, well defined, convex, its 

 process (10 LP) large, stout, directed inward at 45° at basal half, 

 thence caudad, the extreme tip truncate and bearing a small, sharp 

 point on outer angle directed laterad; right hemitergite (10 R) small, 

 irregular, caudal angle a membranous lobe, inner margin produced 

 inward and expanded as a broad pigmented sclerite (10 RPo). Ninth 

 sternite (H) very large, quadrate; developed toward right side as a 

 weak, terminally membranous process (HP). Left paraproct prob- 

 ably represented by a fleshy lobe (LPPT?) subtending 10 LP, setose. 

 Left cercus-basipodite probably represented by a very dark, sclerotic 

 sclerite (LCB?) fused basally to H. Right cercus-basipodite (RGB) 

 a nearly complete ventral, ragged ring at base of right cercus. Left 

 cercus with basal segment LCi very large, broad, cylindrical basally, 

 but apically abruptly produced inward as a large echinulate nodule; 

 outer apical angle membranous. Terminal segment narrow, gradually 

 acuminate distad. Basal segment of right cercus stout, cylindrical, 

 submembranous dorsally ; terminal segment similar to that of LC, but 

 stouter. 



Female. — Unknown, 



nolotype.—M2i\&, on slide, U.S.N.M. No. 56041. 



Type data. — Upper Putumayo River, Colombia (B. Guevara) 

 (USNM). 



Remarks. — The large size and uniform brown color give this species 

 the general appearance of a Clothoda. It is named for Dr. A. B. 

 Gurney, of the United States Bureau of Entomology and Plant 

 Quarantine. 



MICROEMBIA, new ge«us 



Males. — Small, 4.5 to 5 mm. long. Head with eyes large, facets 

 very prominent; clypeal margin heavily sclerotized, rugose, lateral 

 angles produced. Antennae relatively large. Mandibles very large, 

 broad outer margins strongly arcuate ; apices microdentate, three den- 

 tations on the left and two on the right mandible. Terminal seg- 

 ment of labial palpus strongly tapered and pointed. Prothorax small. 

 Legs long, slender; hind basitarsi elongate, ventral setae long, with 

 only a very small terminal sole-bladder. Wings relatively large ; Ri 

 narrow, terminating abruptly before apical margin; R.+s simple; 

 R^^s forked before middle; M and Cuia simple; R4+5, M and 

 Cuia represented only by rows of setae and pigment bands ; two cross- 

 veins present between apex of Ri and R2+3 of f orewing ; hyaline bands 

 broad, bordered by definite rows of macrotrichiae. Terminalia small, 

 pale; tenth tergite entirely cleft to basal margin forming a broad, 

 membranous basal area; left hemitergite bearing a narrow, simple 

 process projecting straight back from inner margin; right hemiter- 



