276 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



insect seems to place the species in the Encyrtini rather than in any 

 other group. The shading in the figure of the wing is intended only 

 to give an idea of the general shape of the infuscated areas. 

 Type of the genus. — S. townsendi Crawford. 



SOPHENCYRTUS TOWNSENDI, new species. 



Female. — Length 2.25 mm. Brownish black; antennae light brown; 

 head broader than thorax, thin anterio-posteriorly, excavated 

 behind, the vertex carinated medially and laterally sharply angu- 

 lated; lateral ocelli touching carinated edge; head about one-third 

 broader than high; face finely lineolate, above insertion of antennse 

 becoming indistinct ; mesoscutum anteriorly finely transversely lineo- 

 lated, posteriorly smooth; dorsal part of axillge finely, deeply, closely 

 punctured, the oblique part smooth; scutellum basally with fine, 

 deep, crowded punctures, rest of scutellum, except smooth apical 

 portion, semicircularly striate, so that from above the scutellum 

 appears more conical than it really is ; propodeum and pleurae smooth ; 

 legs brown, knees, apices of tibiae, and the tarsi lighter; wings, except 

 infuscated spots, hyaline; abdomen smooth, polished. 



Male. — Unknown. 



Hahitat. — Piura, Peru. 



Type.— Cat. No. 13869, U.S.N.M. 



Described from one specimen received through the Bureau of Ento- 

 mology from Prof. C. H. T. Townsend, who reared it from the abdo- 

 men of an adult Stenomacra,s]). and sent it under his number 10010°3a. 



Professor Townsend, in a letter to Dr. L. O. Howard, says regarding 

 this species : 



This parasite exactly counterfeits the small black ants that make their nests in 

 mesquite trunks and are always running up and down the trunks among the Stenoma- 

 cras, but never molesting the latter. The parasite in life holds its black-barred wings 

 tightly appressed to body, so that they are quite invisible. Even with a lens I thought 

 the parasite was wingless. After death the wing muscles relaxed, and I was surprised 

 to note the wings at the first glance with the lens. The form of the body and the 

 color are both quite like the ant, but I could see by its movements in life that it was 

 not an ant, and that with the naked eye. It jumps when disturbed. 



Tribe MIRINI. 

 LEUROCERUS, new genus. 



Belongs to the series in which the female has greatly dilated and 

 flattened foliaceous antennae; front prominent and with fine thimble- 

 like punctures interspersed with larger ones; antennae with 6-jointed 

 funicle, the joints of the club fused (fig. 4) ; facial impression bounded 

 by an angulation but not carinated; lateral ocelli touching eyes and 

 nearer to each other than to the anterior ocellus; axillae not touching 

 medially; scutellum without an apical tuft of hairs; wings fuscous, 



