3T6 HYMENOPTERA OF AMERICA. [PART I. 



Eab. The hot parts of Mexico. 3 % . I caught the type in 

 Fueblo Yiejo, near Tampico ; the variety is from Orizaba. 



2. A. Brasilieiisis Sauss. — A. Mexicano affinissimus ; at clypeo et 

 thorace immaculatis ; abdominis segmeiitis 30-5° tenuissiine flavo- 

 inarginatis, lituris 4'' et 5' interruptis ; tarsis ferrugineis. 



Alastor Brasilieiisis Sauss. Et. Vespid. Ill, 321), 211, pi. xvi, fig. 1, % 

 (1854). 



Hob. Brazil. 



Subgenus ALASTOR proprie diet. 

 (Sauss. Vespides, III, 328.) 



First abdominal segment without transverse suture. 



The American species form the 



Division HYPALASTOR. 

 (Sauss. Vespid. Ill, 328.) 



Form slender and cylindrical. Metathorax superiorly pro- 

 duced behind the post-scutel, then truncate; its margins 

 sharp. (A group quite corresponding to Hypalastoroide s.) 



3. A. anglllicollss Spin. — Niger; pronoti margine antico, macula 

 subalaii, tegulis, fascia scutelli, margine postico abdominis segmentoruui 

 I s , 2', luteis ; autennis pedibusque ferrugineis, his basi nigris ; alis fer- 

 rugineis, apice griseis. — Long. 1 1 mm. 



9 . Clypeo nigro, antennarum scapo nigro, flagello superne conspurcato. 

 — % • Clypeo luteo; scapo rufo superne puricto obscuro. 

 Odynerus anguUcollis Spikol. in Gay's Hist. fis. de Chile, Zool., VI, 201, 



7 (1851). 

 Alastor amjulicollis Sauss. Et. Vespid. I, 25S, 14, pi. sxi, fig. 7, % • 



Hab. Chili. 



4. A. melaiiosoma Sauss. — Omuinoater, gracilis, cylindricus; clypeo 

 9 grosse punctato, apice late subexciso,subbidentato ; capite et thorace 

 grosse punctatis ; thorace antice latiore, pronoto biangulato, in margine 

 antico et in lateribus marginato, metanoto valde rugoso, coarctato, valde 

 pone post-scutellum producto ; postice valde foveolato ; margine circu- 

 lari acutissimo superne fisso ; margine infero bidentato (seu quadri- 

 dentato) ; abdomine antice acute truncato. 



Alastor melanosoma Sauss. Et. Vespid. I, 259, 15, pi. xxi, fig. 8, $ (1852). 



Total length, 14 mm. ; wing, 10 mm. 



