ART. 10 GALL-INHABITING CYNIPID WASPS— WELD 115 



EUCEROPTRES MONTANUS. new species 



Female. — Black, tarsi, and antenna beyond scape brownish, all 

 femora and tibiae li<;liter brown. Head and thorax in certain po- 

 sitions showing apj)ressed whitish pubescence. From above head 

 is transverse, occiput concave, cheeks not broadened behind eyes; 

 from in front broader than high, broadest above at level of anten- 

 nae, malar space .57 eye without groove, antennae 14-segmented, 

 lengths as (scape) 14( width 7) : G(6) : 15(5.5) : 17 : 15 : 14(6) : 13 : 

 12:11:10:9:9:8:14(5), or 15-segmented with the last two as 7 is 

 to 9. Sides of pronotum finely rugose. Mesoscutum broader than 

 long, para^jsidal grooves narrow, smooth, percurrent, anterior and 

 lateral lines short and smooth, traces of median groove posteriorly, 

 surface faintly transversely ridged. Pits of scutellum open behind 

 on to disk which is more coarsely rugose posteriorly. Carinae on 

 i:)ropodeum parallel, enclosing a nearl}^ square smooth area. JNIeso- 

 pleura with polished bare area posteriorly. Middle and hind coxae 

 with a polished bare spot. Hind tarsus and tibia subequal, tarsal 

 segments as 33:15:10:8:11 (including claw 16), claws weak with 

 a weak tooth. Fore wing pubescent and ciliate, veins brown, radial 

 cell closed, length to breadth as 23 : 8, areolet reaching one-fifth, 

 cubitus about one-half way to basal. Abdomen shorter than head 

 and thorax, length to height to width as 40 : 28 : 22. Lengths of 

 tergites measured along dorsal curvature as (petiole) 5:61:23:10: 

 0:0:8, petiole smooth, third and fourth microscopically punctate, 

 seventh pubescent, ventral valves projecting horizontally well be- 

 yond tergites, ventral spine very short. Using width of head as a 

 base the length of mesonotum ratio is 1.1, antenna 2.3, wing 3.0, 

 ovipositor 1.5. 



Range in length, 1.8-3.3 mm. Average of 58 specimens, 3.0 mm. 



Male. — Differs from female in having antennae 15-segmented, 

 lengths as (scape) 13 : 5 : 17 : 19 : 17 : 16 : 15 : 14 : 13 : 12 : 11 : 10 : 10 : 9 : 13 

 or 16 segmented by the division of the last into tAvo of almost equal 

 length, third incised, flagcllum tapering gradually from about 

 middle to apex. Abdomen shorter than thorax, length to height 

 to width as 94 : 70 : 53. Lengths of tergites measured along dorsal 

 curvature as (petiole) 5:55:22:2:0:0:20, petiole smooth, seventh 

 conical with white pubescence dorsally. Length of antenna 

 ratio, 2.7. 



Range in length, 2.1—3.2 mm. Average of 48, 2.77 mm. 



Ti/pes.— Cat No. 27228, U.S.N.]\L Type female, allotype, 18 

 female and 20 male paratypes. Paratypes in American Museum, 

 Field, Stanford, Philadelphia Academy, and California Academy. 



