IQ PROCEEDINGS OP THE NATIONAL MUSEUM vol. 69 



and nemorum) ; hind trochanter of male without spur (rudimentary 

 in nietallica) ; ventral surface of basitarsus with short black basal 

 spines (except metallica). Front of male usually broad. 



KEY TO SPECIES OF XYLOTOMIMA 



(Metasternum pilose. Type, Xylota vecws Osten Sacken) 



A\ Legs entirely black. 



B\ Wholly black species chalybea ( Wiedemann ). 



B'. Abdomen chiefly red pigra (Fabricius). 



A^ Legs partly yellowish. 



B\ Abdomen chiefly purplish red libo (Walker), 



B^ Abdomen black, with or without yellow spots. 



C\ Abdomen shining black; legs chiefly orange. 

 D\ Coxae black. 



E\ Halteres black ; transverse depression on fourth tergite oc- 

 curs at the middle plesia (Curran). 



E^ Halteres yellow ; depression on fourth tergite at basal 



third curvlpes, variety satanica (Bigot). 



D^ Coxae yellow vecors (Osten Sacken). 



C". Abdomen not entirely shining black, usually with yellow spots and 

 legs chiefly black. 

 D\ Hind femur yellow at base ; fore legs yellowish brown. 



metallica (Wiedemann). 

 D^ Hind femur black at base; fore legs largely black. 



E\ Face partly yellow anthreas (Walker). 



E^ Face black. 



F\ Arista yellow at base (eastern) baton (Walker). 



F^ Arista entirely dark (western). 



G\ Ocellar and mesonotal pile blackish ; abdominal spots 

 yellow (occasionally dark in female). 



nemorum, variety americana, new variety. 



G^ Ocellar and mesonotal pile chiefly pale; abdominal 



spots dark aeneous dubia, new species. 



XYLOTOMIMA CHALYBEA (Wiedemann) 



Xylota purpurea Walker. (In British Museum.) 



The black coloration of the entire insect is so characteristic of this 

 species that further description is unnecessary. The specimen upon 

 which Walker based his species lacks the head and the country of 

 its origin is unknown. However, what remains of it bears such a 

 close resemblance to chalyhea that it may well be assigned as a syn- 

 onym of this species. Metcalf has figured the male genitalia. 



Distribution. — A fairly common species in the eastern part of 

 North America. Recorded from Kansas (Crevecoeur). Not re- 

 corded south of North Carolina. 



Type. — Location unknown. 



XYLOTOMIMA PIGRA (Fabricius) 



Xylota riibiginigaster Bigot. (Type examined. In British Museum.) 



Fairly large and slender species about 12 mm. Everywhere black- 

 ish except abdomen beyond first tergite. Antennae rather small; 



