E. T. CRESSON, JR. 61 



The mesonotum is densely granulose and therefore opaque. 

 The scutellum is large and flattened, and the wings are tinged 

 with brown. In color it is similar to centralis, but slightly larger 

 in size. 



Ochtheroidea similis new species 



Black; middle and hind tibiae and their tarsi, fore tarsi, except two black 

 apical joints, yellow; halteres white. Wings hyaline with black veins. Shining 

 to nearly polished. 



Face more than one-half as broad as vertex, very strongly and rather abruptly 

 convex; facalia distinctly transversely wrinkled. Cheeks at least one-half as 

 high as eyes. Mesonotum and scutellum microscopically granulose. Length. — 

 2.5 mm. 



Type. — cf ; Cachi, Costa Rica, March 7, 1910, (beaches on 

 back channel of Rio Reventazon), [Type No. 613-1]. Paratijpe. 

 — 1 cT ; topotypical. 

 Ochtheroidea laevis new species 



Similar to glaphyropus, but larger. Two apical joints of fore tarsi black. 

 Entirely polished, without any apparent sculpturing. Face one-half as broad 

 as vertex, in profile prominent and convex below. Cheeks one-fifth as high as 

 eyes. Length. — 2.5 to 3 mm. 



Type. — d^ ?; Alajuela, Costa Rica, September 15., 1909, (sweep- 

 ing), [Type No. 6135]. Paratypes. — 4 specimens, topotypical. 

 Ochtheroidea glaphyropus Loew 

 1878. Athyrogloasa gUiphyropus Loew, Zeit. f. d. Ges. Naturw., li, 197. 



This species has the face and cheeks narrow. The mesonotum 

 is shining although minutely pitted, and the convex scutellum 

 is sometimes nearly scabrous. It will be easily recognized 

 among those with hyaline wings and white fore tarsi. Length. — 

 1.75 nun. 



It was described from Texas, but is represented by two speci- 

 mens in this collection: Bonncfil Farm, Rio Surubres, October 

 20; Turru cares, Rio Sitjuiares, December 19. 



LYTOGASTER 



1896. Becker, Bcrl. Ent. Zeit., xli, 202. 



A genus readily distinguished by the unusually convex, sub- 

 hemispherical abdomen, caused by the shortening of the dorsal 

 part of the second and third segments and elongation of the 

 fourth. The lateral margins are revolute, not sharp and not clos- 



TRANS. AM. ENT. SOC, XLIV. 



