202 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



3. Antennocular space equal to oeellocular. A smoky brown species from Arizona 



fvmosa Weld, p. 204. 



Antennocular space less than oeellocular. Light yellowish brown 



pumiliventris (Bassett), p. 205. 



—Colorado (Gillette). 

 —radicis Ashmead. 



7. TRIGONASPIS OBCONICA, new species. 



Female. — Black with abdomen, legs, clypeus, and scape red, 

 flagellum brownish-red. Head broader than thorax, finely coria- 

 ceous, face slightly pubescent, clypeus truncate and protruding, 

 median ridge below antennae, malar groove present, malar space 0.4 

 eye, ratio of antennocular space to oeellocular as 8 to 13, eyes bare, 

 mandible 2-toothed, antennae 14-segmented, the third longest, last 

 not quite twice preceding, distal third not thinner. Mesoscutum as 

 long as broad, smooth and shining with a few minute hair-bearing 

 punctures seen in balsam mount along the distinct deep smooth per- 

 current parapsides, no anterior, lateral or median lines. Length of 

 scutellum 0.55 the width of head, rugose with microscopic punctures, 

 margined behind, with two impressed triangular areas on sides, base 

 with transverse arcuate furrow divided by a median longitudinal 

 ridge which runs back one- third the length. Mesopleura smooth and 

 polished except triangular area under wing. Propodeum with two 

 slightly bent ridges inclosing a median area one and a half times as 

 high as broad and smooth in center, spiracular areas somewhat rugose 

 with hair-bearing punctures, spiracles elliptical. Legs with hind 

 tarsi shorter than tibia, third and last segments equal, claws with an 

 obscure tooth at base. Wings large, with distinct brown veins, 

 pubescent and ciliate, notable for a large dark spot in base and three 

 smaller ones in distal end of third cubital cell (R) and a larger fainter 

 one in cell below, clouded around median hinge, cubitus reaching 

 quite to basal, areolet present. Abdomen smooth and polished, 

 Longer than high, slightly compressed, second tergite two-thirds the 

 length with slightly pubescent patches on sides, ventral spine in 

 balsam hairy and broadened behind tip, ovipositor when dissected 

 out not quite half length of antenna, ovarian eggs well developed. 

 Using width of head as a base, the length of mesonotum ratio is 1.48; 

 antenna, 2.8-2.9; ovipositor, 1.46; wing, 4.6. 



Male. — Antennae 15-segmented, third longest and strongly ex- 

 cavated and thickened at apex, flagellum gradually tapering toward 

 end, last segment shortest, length 4.9 times width of head. Abdo- 

 men petioled, compressed, infuscated posteriorly, second segment 

 about half the length. 



Range in length of 16 pinned males, 2.4-3.5 mm. Average, 3.2 

 mm. The two females measured 3.5 and 3.8 mm. 



Type.— Cat. No. 22583, U.S.N.M. Female type, allotype, and 10 

 male paratypes. 



