53^ CALIFORNIA ACADEMY OF SCIENCES. 



Prothorax short, broad, with produced lateral angles 

 with a spine in each angle, and a series of fourteen 

 strong, sharply pointed hairs along the convex posterior 

 margin; no blotches. Metathorax short, broad; lateral 

 margin with two or three spines, angles with a hair and 

 nearly straight posterior margin with a series of hairs 

 weaker than those of the prothorax. Legs pale, con- 

 colorous with body, with short stiff hairs on femora and 

 tibiae. 



Abdomen elliptical, narrow r at both ends, with numerous 

 strong hairs in posterior angles of segments and on lateral 

 margins: numerous hairs on dorsal surface; whole ab- 

 domen whitish, with narrow, clear, lateral bands, with 

 lateral processes projecting inward from anterior angles 

 of each segment; last segment uncolored, parabolic, with 

 four hairs on posterior margin, two near each end and 

 none in the middle. 



Female. Body, length 1.6 mm., width .69 mm.; head, 

 length .31 mm., width .47 mm.; abdomen elongate-ovate, 

 tapering at posterior end, the last segment uncolored, 

 narrowly rounded behind, with a fringe of fine uncol- 

 ored hairs along posterior margin. 



Menopon dissimile n. sp. (Plate lxxiii, rig. 5.) 



One male, one female, and one immature specimen, 

 from the Purple M a rtin,/V #£-;/£ 5/^/s(Lawrence, Kansas) , 

 resembling somewhat M. rust i cum, Giebel (Insecta 

 Epizoa, p. 288), from Hirundo rustica and H. rifaria, 

 but more than a third larger, without the well marked 

 antennae and ocular bands of rust /rum, and with spines 

 and hairs on the prothorax, which is bare in rusticum. 

 This species and rusticum present a Menopon type which 

 in the shape and character of the head and thorax and 

 in the sternal markings approaches Nitzschia. 



