AMERICAN HYMENOPTERA. 237 



coarse a.s in D. aprilis, vertex not coriaceous ; abdomen rufous, the ba- 

 sal plates and three apical segments black ; legs black at base, the an- 

 terior femora, their tibine beneath, and the four posterior femora, ex- 

 cept at tip, yellow-red; tarsi fuscous; remainder black; inner claw 

 tooth obtuse; wings hyaline, faintly clouded toward tips, nervures 

 blackish, lower half of stigma piceous. 



% . The male has all the feraoi'a rufous, except the posterior pair at 

 tip, the four anterior tibias rufous, posterior tibia) and all the tarsi fus- 

 cous; face below the antennje whitish. 



New England, N. Y., N. J., Md., 111., Mackenzie'River, H. B. T. 



7. D. albifrons. 



Do-sr/tlteus: api'icua, var. nlbifrom^, Norton, Best. Proc. viii, 1861, 152, ?>, '^ % . 

 Black ; a wide band on abdomen and most part of the legs rufous ; nioutli 

 and tegulse white. Length 0.19—0.26. Br. wings 0.38—0.52 inch. 



9 . Smaller than the preceding ; antennee and punctures as in D. 

 aj>ricii>i; more of white hair about the orbits and pleura ; edge of nasus, 

 labrum, tegulae, the six basal segments of abdomen and the legs rufous; 

 tips of posterior femora, of the four anterior tibi;x), more or less of pos- 

 terior tibite and all the tarsi blackish; all the trochanters and a band 

 at base of posterior tibife whitish ; no perceptible inner claw tooth ; 

 wings hyaline, nervures black, 



Var. a. All the coxae and trochanters black ; all of legs darker. 



Var. h. Only the tip of posterior tibiae black. 



% . The male has the basal joints of antennre reddish beneath; a 

 spot between antennae, the face beneath and the teguUe white. 



Maine, Conn., N. Y. June. (15 9 , 34 S )• 



This is small, and can readily be distinguished from D. apricus by 

 its white mouth and tegulas, and whitish trochanters and band on fe- 

 mora. 



S. D. abdominalis. 



Dosi/theus abdominalis, Norton, Bost. Proo. viii. ISfil, 153, S, ^ %■ 

 Black; abdomen wholly rufous. Length 0.2S — 0.33. Br. wings 0.56 — 0.6(5 

 inch. 



9 . Abdomen compressed, not very long; antennae moderate, third 

 joint a little longer than fourth ; fourth, fifth and sixth each a little 

 shorter than the one preceding; head and pleura coriaceous, the cross 

 suture back of ocelli distinct; nasus deeply incurved ; basal plates and 

 abdomen rufous; ovipositor sheath and legs black; hinder coxae ru- 

 fous at base ; inner tooth of claw very obtuse and short; wings viola- 

 ceous subhyaline, nervures black. 



%. Antennjie longer, stoutest toward the base; abdomen slender, 

 ba^al plates black; tibia) and tarsi indistinctly piceous. 



