ART. 28 CHALCID FLIES NORTH OF MEXICO BALDUP 39 



rounded, but sometimes narrowed and roughly tapered ; petiole black, 

 abdomen mostly black, only about cephalo-ventral fourth brownish 

 to mostly yellow. 



Head mostly just one half as long as wide, sometimes slightly 

 longer and narrower, transversely ovate-rectangular, front extending 

 but feebly ahead of eyes, occiput only slightly concave, vertex laterad 

 of posterior ocelli finely wrinkled and punctate, malar space smooth 

 wrinkled, not punctured, rest of head coarsely reticulate with a small 

 umbilicate puncture in each reticulation, and moderately hairy; 

 scape of antenna as long as pedicel, Fl and half of F2 combined, 

 pedicel and Fl about equal in length, F2 to F4 equally long and 

 thick, length of each one-fifth greater than diameter, club compact 

 and slightly dilated and as long as F4 and F5 combined; pronotum 

 one-seventh narrower at its widest point than head and mesothorax, 

 upper surfaces of prothorax and mesothorax densely and rather 

 coarsely umbilicate punctate ; propodeal groove deep, broad, rounded, 

 crossed in front by a prominent carina; surface of propodeum 

 coarsely rugose reticulate, more so in front of the carina ; submarginal 

 vein with 13 (rarely) to 19, frequently 18, setae; abdomen shiny, 

 smooth polished, except sometimes third and fourth segments 

 partly coriaceous, bare, except beyond third segment, latter with 

 a transverse row of hairs in the middle, posterior surface of abdomen 

 around ovipositor sheath moderately hairy and punctate, sheath 

 extending prominently above tip of abdomen. 



Male. — On the average smaller than the female, but in color, vesti- 

 ture, sculpturing, and form like the female, except the usual differ- 

 ence in the shape of the abdomen and the antennae ; Fl about one-sixth 

 longer than pedicel, F2 barely or not at all longer than F3 and F4, 

 F2 to F4 each one- fourth longer than thick, club feebly dilated and as 

 long as F3 and F4 combined. 



Remarks. — The original Walsh specimens of duhia are perhaps 

 destroyed. One female in the United States National Museum col- 

 lection is labeled ^^ Decatovia dubia Walsh," probably in Walsh's 

 handwriting, but there is no date, locality, or host given to show 

 whether or not it was used in preparing the original description. 

 Only five females and one male were originally at hand when the 

 form was described. They were reared by Doctor Walsh from the 

 galls of Disholcaspis mamma (Walsh) on the mossycup oak {Qiiercus 

 macrocarpa) . 



This species is well represented from areas ranging from Arizona 

 and Texas through the Mississippi Valley to the Atlantic Ocean 

 from the northern to the southern limits of the United States. But 

 considering the distribution of its variety doanei FuUaway, duhia 

 occurs also in California areas of the country. Whenever host 

 records accompany the specimens they indicate that duhia inhabits 



