IdESTEUMON-FLIES — GELINAE I MESOSTENINI 513 



punctures on mesopleurum separated by about 0.2 their diameter; 

 hairs on front face of hind femur sparse, their sockets separated by 

 about 2.0 the length of the hairs; hairs on hind tibia exceptionally 

 sparse and coarse, the sockets of those on its front side separated by 

 about 0.7 the length of the hairs (in all other species the sockets sepa- 

 rated by about 0.3 the length of the hairs) ; areolet about 0.5 as high 

 as radial cell, about 0.78 as long as high; second abscissa of discocu- 

 bital about same length as third abscissa; punctures on second tergite 

 separated by about their diameter; ovipositor sheath about 0.50 as 

 long as front wing. 



Black. Head, thorax, and hind coxa marked with white as in 

 figure 338, g; face entirely white or sometimes (in paratype) black 

 medially; flagellum with a white band covering about 3 segments; 

 labrum, base of mandible, markings on palpi, sometimes (in type) 

 elongate median mark on mesoscutum, sometimes (in type) lateral 

 margin of median and lateral lobes of mesoscutum and front end of 

 median margin of lateral lobe, outer side of front and middle coxae, 

 and under side of front and middle first trochanters, white; second 

 trochanter dusky ferruginous; legs beyond trochanters fulvous, the 

 second through fourth segments of hind tarsus partly whitish; wings 

 hyaline; abdomen fulvous, the first segment infuscate basally and apex 

 of its tergite narrowly whitish. 



Type: 9, reared from Prosopis, material collected Apr. 25, 1957, 

 adult emerged Sept. 3, 1957, Death Valley, Cahf., R. C. Hall (Wash- 

 ington, USNM 63841). 



Paratypes: 9, Indio, Calif., Sept. 21, 1948 (Berkeley). This speci- 

 men also bears a label "Indio area, Apr. 25, 1949." Possibly Sept. 

 21, 1948, was the collecting date of material to be reared and Apr. 

 25, 1949, the date of adult emergence. 



5. Genus Helcostizus 



Figure 326,a 



Brachycentrus Taschenberg, 1865, Zeitschr. Ges. Naturwiss. Halle, vol. 25, p. 106. 



Name preoccupied by Curtis, 1834. Type: {Brachycentrus pimplarius 



Taschenberg) = albator (Thuuberg); monobasic. 

 Helcostizus Foerster, 1868, Verb. Naturh. Ver. Rheinlande, vol. 25, p. 186. Type: 



(Cryptus brachycentrus Grsivenhorst) = albator (Thunberg); designated by 



Viereck, 1914. 

 Cyrtocryptus Marshall, 1872, A catalogue of British Hymenoptera, vol. 3, p. 41. 



Type: {Cryptus brachycentrus Gravenhorst) = albator (Thunberg); monobasic. 

 Mesocryptus Thomson, 1873, Opuscula entomologica, fasc. 5, p. 519. Type: 



{Cryptus brachycentrus Gravenhorst) = albator (Thunberg); monobasic. 

 Hcterocryptus Woldstedt, 1873, Bidr. Finland Naturkann, vol. 21, p. 73. Type: 



{Cryptus brachycentrus Gravenhorst) = albator (Thunberg); designated by 



Viereck, 1914. 

 Asternaulax Viereck, 1912, Proc. U.S. Nat. Mus., vol. 42, p. 632. Type: {Aster- 



naulax fiskei Viereck) = albator canadensis (Provancher) ; original designation. 



