NO. 1487. NORTH AMERICAN DIGGER WASPS— FERNALD. 373 



increasing in number backward, and a few scattered punctures occur, 

 particularly on the terminal plate. 



WhujK. — Yellowish hyaline, a little fuliginous on the outer margin 

 of the fore wings, the yellowish being a little deeper toward the base; 

 first recurrent vein of the fore wing nearly or entirely interstitial 

 with the second transverse cubital; the second and third transverse 

 cubitals very close together on the radial; cubital vein of the hind 

 wing with a slight backward bend near its middle; obsolete })eyond 

 the transverse cubital; the discoidal vein not quite insterstitial; tegu- 

 laj black, faintlj" sericeous, with a trace of 3'ellow pubescence near the 

 center; the outer edge slightly reflexed. 



Legs. — Coxifi, trochanters and femora black; sericeous, particularly 

 beneath; fore femora yellow pu])e.scent beneath and on the lower part 

 of the outer side; fore and middle tibise and tarsi sericeous abov^e, 

 dark ferruginous, the tips of the claws l)lack; fore metatarsi with ten 

 comb teeth, shorter than half the length of the metatarsus; hind tibite 

 sericeous, with a dense brown band, coarser than elsewhere, on the 

 posterior face; inner edge of the hind tibia not straight, but curved, 

 hollowing along its middle, rather dilated at the ends. (Plate VI, tig. 4. ) 



Male. — Differs from the female in the following respects: 



Generally more pul)escent; the pubescent spot behind the protho- 

 racic lobe larger and extending downward to connect with the spot 

 above the middle coxa; the first recurrent vein not quite as nearly 

 interstitial with the second transverse cubital as in the female; abdo- 

 men less oval, being quite broad at the tip; the last dorsal al^dominal 

 plate with a slight excavation at the side, behind; thence evenly 

 rounded except for a very slight median emargination; seventh ventral 

 abdominal plate with a weak median carina; its lateral margin curving 

 evenly toward the middle line for some distance, then with a broad, deep 

 notch; with a slight, broad depression running from the base of the 

 <'arina outward and backward to the posterior angle where the notch 

 begins and a tuft of yellowish hairs just outside this depression, on 

 the margin of the plate; terminal plate small; its posterior margin 

 evenly rounded, Avith a circular depression in the center of the plate. 



Variations. — In some specimens the black band between the pubes- 

 cence along the stigmatal groove and that on the dorsum and hinder 

 end of the median segment is encroached upon b}' the pubescence; 

 the abdomen is almost fringed on the hinder margins of the last two 

 or throe dorsal plates with short, pale hairs; the median excavation on 

 the hinder margin of the last dorsal plate is sometimes quite pro- 

 nounced; the mesosternum may be distinctly pubescent, and the hind 

 wings may be slightly fuliginous on the outer border; abdomen some- 

 times varied with dark. 



Zt^;i(/^/!.— Females, a^-ST nun.; males, 24-26 mm. 



