250 Annals Entomological Society of America [Vol.11, 



Cordyligaster septentrionalis n. sp. 



Length, 11 to 13 mm. Ground color black, more or less shining; 

 head silvery-white pollinose, thinner at vertex both before and behind; 

 frontalia brown or black, somewhat shining; antennae black, thinly 

 silver}' dusted; pk^urae, coxae and narrow bases of last three abdomi- 

 nal segments silvery-white ; mesoscutum and scutellum shining-metal- 

 Hc, without vittae; tegulae transparent; wings with wide costal border 

 smoky -yellowish, faintly tinging inner portion. Apical cross-vein 

 deeply bowed inward, forming right-angle with fourth vein. Palpi 

 pale -yellowish but appearing blackish from black hairs and silvery 

 bloom. Femora very thinly dusted with silver. 



Type, No. 12625, U. S. N. M. 



Numerous specimens of both sexes from Plummers Island, 

 Maryland, June and July, 1907 (Dr. A. K. Fisher). 



Parachaeta Coqt. 



The generic description of Parachaeta needs revision. Only 

 the male was' described. That sex is without macrochaetae on 

 the second abdominal segment, while the female has a pair of 

 stout macrochaetae on the hind margin of that segment and 

 sometimes a shorter pair between them. The absence of macro- 

 chaetae on the second segment thus becomes a secondary sexual 

 character in this genus. 



The common New' England species is the Parachaeta bicolor 

 of Coquillett's Revision but not of Macquart. The female is 

 darker in coloration than the male, and shows no reddish on sides 

 of abdomen in the specimens that I have examined. The 

 species does not agree w^ell with Bigot's description of inermis. 

 The type of the latter must be examined. 



