16 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.69 



Length of body, (1.66 to) 1.93; length of head, 0.608; width of 

 head, 0.723 ; width of vertex at ocelli, 0.261 ; length of antenna, 1.50 ; 

 width of mesoscutum, 0.645 ; length of fore wing, 1.53 ; width of fore 

 wing, 0.702 ; length of ovipositor, 0.325 mm. 



Male. — Similar to the female in coloration, the pleura, sternum, 

 and venter more strongly bluish and purple, the apex of the abdomen 

 above also brilliant blue and purple; the white setae of mesoscutum 

 sometimes more or less numerous, or replaced with blackish setae. 



Length of body, (1.60 to) 1.83; length of head, 0.601; width of 

 head, 0.784; width of vertex at ocelli, 0.386; length of antenna, 1.42; 

 width of mesoscutum, 0.716; length of fore wing, 1.72; width of fore 

 wing, 0.813 mm. 



Described from eight females and nine males (holotype female, 

 allotype, and paratypes) reared from Hemerobiid cocoons collected 

 November 5 and 30, 1919, at Ojai Valley, California (H. M. Armi- 

 tage). Two species of Syin'pherohius were reared from the same lot 

 of cocoons, one of these being S. calif ornicus Banks. 



Type.— C&t. No. 28142, U.S.N.M. 



AZTECENCYRTUS, new genus 



This genus has much the habitus of Homalotylus Mayr, and agrees 

 with it in many important characters, but differs in the shape and 

 dentition of the mandibles, the length of the antennae, and par- 

 ticularly that of certain joints, such as the scape, pedical, and first 

 funicle joint, and in having the head thicker and more hemispherical, 

 the wings narrower, with the stigmal and postmarginal veins more 

 unequal and much less nearly parallel, the surface of the body much 

 smoother and shiny, but not polished, and the coloration wholly 

 nonmetallic. Aztecencyrtus also closely resembles Brethesiella Por- 

 ter in many respects. 



Genotype. — Aztecencyrtus f-avus^ new species. 



Female. — Head hemispherica], rather thick frontooccipitally, the 

 curvature uniform from occipital to oral margin; in dorsal view 

 appearing semicircular but more strongly rounded on the sides 

 than in front, the occipital margin very slightly arcuately emargi- 

 nate; as seen from the side the outline is somewhat semicircular, 

 with the curvature considerably less at the face than dorsally; 

 as seen from in front the length and width are about equal, the 

 outline fully rounded above, the sides considerably less rounded, 

 the cheeks converging a little toward the broad truncate oral margin. 

 Occiput only very slightly concave, the neck inserted near the 

 middle, the dorsal margin distinctly angled; eyes moderately large, 

 about one-half longer than wide, oval, and widest near the anterior 

 end, the inner orbits parallel as seen in dorsal view of head ; f ronto- 

 vertex twice as long as wide, the width distinctly less than one- 



