136 MUSEO NACIONAL DE BUENOS AIRES. 
Nysson argentinum BRETHES, n. Sp. 
2 Nigrum, segmentis 1-4 (vel 1-3) apice (in medio plus minus in- 
terrupte) flavis; mandibulis basi, labro, scapo apice, tegulis, 
apophasis mesonoti, spinis segmenti mediarii, pedibusque fer- 
rugineis; alis paulum infuscatis. Long. corp.: 9-12 mm. 
Clypeo fronteque, pronoto postice, mesonoto linea antica longi- 
tudinali interdum, scutello antice, postscutello utrinque, segmento 
mediario prope spinam plus-minus intense aureo-sericeis, segmentis 
apice breve aureo-fimbriatis. Clypeo modice convexo, apice late ar- 
cuate truncato, fronte supra antennas tubereulo compresso instructa, 
capite modice grosse punctato, inter ocellos posticos tuberculis 2 
parvis instructo, genis postice marginatis et paulum unispinosis; 
mesonoto grosse sparce punetato, prope scutellum apophysis orna- 
to, seutello utrinque sursum versus laminato, basi et longitrorsum 
impresso, quam mesonotum densius punctata, postscutello bidentato, 
segmento mediario utrinque spina valida armato, supra vix areola- 
to, parte postica verticali, truncata, lineis 6 basin versus abdominis 
convergentibus, mesopleuris grosse punctatis, in medio unidentatis, 
antice, subtus, et postice deorsum versus cristatis, abdomine segmen- 
tis 2 primis sat minute sparceque punctatis, segmento 2.” ventrali in 
medio antico sat producto, valvula supraanali sat elliptica, paulum 
punctata, tibiis posticis 9-spinosis. 
S A 9 differt: abdomine segmentis dorsalibus distincte puncta- 
tis, ventrali 2. minus producto, valvula supraanali quadrata, apice 
-SPInoOsa. 
Mendoza.—Col. Mus. Nac. Buenos Aires. 
Fam. CRABRONIDAE 
Crabro (Podagritus) Jórgenseni BriTHES, n. sp. 
9 Niger, mandibulis basi, scapo, callo humerali, scutellis, femort- 
bus 4 
flavis; tegulis, abdomine segmentis 1.2 apice, 2.2 viz toto rufis, 
tarsis medúis sat testaceis. Long. corp.: 10.5 mm. 
anticis apice, tibiis anticis antice, tibiis 4 posticis bast 
