NO. 2242, 



MORPHOLOGY OF THE 8TREPSIPTERA— PIERCE. 



479 



the inner angle ; the point of attachment on the second joint is dorsal 

 and very near its base; this joint and the third are both slender at 

 base, gradually enlarged, piilvillate beneath, apically truncate. The 

 antennae are quite long, the stem portions of the joints being longer 

 than usual. The last joint reaches as far back as the scutellum. The 

 length of the praescutum and scutellum about equals that of the post- 

 lumbium and postscutellum. 



Female. — Cephalothorax about 0.2 mm. long, golden yellow, not 

 much darker behind the opening of the brood canal; almost one- 

 quarter longer than wide ; sides constricted at base, parallel at mid- 

 dle, angulate and convergent from anterior third, sinuate at apex. 

 Mandibles large, obtuse with outer edges marginal; front convex ex- 

 tending beyond mandibles and separating them by a little more than 

 their width. Opening of brood canal broad, trapezoidal. Spiracles 

 ventral, close to margin. 



Type. — Four paratype males, and allotype female. Cat. No. 18813, 

 U.S.N.M. 



41. Genus AGALLIAPHAGUS Pierce. 



1. A. americana Perkins ; parasite of Agallia quadrinotata; Ohio. 



2. AGALLIAPHAGUS UHLERI, new species. 



Plate 73. 



Described from a female from Agallia uhleri Van Duzee collected 

 at Rocky Ford, Colorado. 



Female. — Cephalothorax transverse. Head occupying over one- 

 half the length, and broadly, narrowly emarginate behind, slightly 

 convergent on sides, slightl}^ emarginate at base of mandibles, which 

 are closer to the oral orifice than their widths; oral orifice large and 

 transverse. Spiracles reaching lateral margin, but not prominent. 

 The opening of the brood canal is short and transverse. 



The measurements, using the same scale as in Andrena are as 

 follows : 



Specimen . 



Index 

 total. 



Type : 



Relative proportions to breadth at spiracles . 



4.55 



This species is quite different in form from A. americana.) differing 

 especially in the lesser emargination of the head, 

 ry/^e.— Cat. No. 21456, U.S.N.M. 



42. Genus COLACINA Westwood. 



This genus has been transferred to the Halictophiiginae because 

 of the nearness of its habitat and host to those of Neocholax. 



1. C. insidiator Westwood; parasite of Efora subtilis Walker, 

 Borneo. 



