ALASTOR. 313 



rufo, nigro-marginato et utrinque punctilio albido ; antennis rufis, apice 

 nigris ; pronoto, macula subalari, fascia scutelli, post-scutello, punctis 

 2 in summo metauoto tegulisque, luteis; petiolo apice, luteo-inarginato; 

 abd. segmentis 2°, 3° luteo-limbatis, secundo iusuper basi fascia lutea; 

 pedibus rufls ; alis ferrugineis, apice griseis, J • — Longit. 13 mm. 



Epipona pilipalpa Spinola, in Gay's Hist. fis. de Chile, Zool., VI, 252 



(1851). 

 Pterochilus pilipalpus Sauss. Et. Vespid. I, 247, 12, pi. xx, fig. 8. 



Hab. Chili (1 9 in the Paris Museum). 



This insect is a native of Chili, and has the same sort of livery 

 as most of the Hypodynerus, the Gayella and Alastor from Chili ; 

 that is, black, hirsute, with rufous feet and white fascias and 

 rather ferruginous wings, fuscous at tip. This livery of the 

 Chilian Vespidse is one of the most characteristic to be met with 

 in the geographical distribution of insects. 



Gen. ALASTOR Lepel. St. Fakg. 

 Alastor Lep. ; Sauss. ; Smith. 



The same characters as in Odynerus. — Abdomen sessile. — The 

 second cubital cell of the anterior wing petiolate upon the radial 

 cell. 



The Alastors are only, so to speak, bat Odyneri, in which the 

 2d cellule of the wing becomes petiolate. This modification can 

 produce itself in every section of the Odyneri; so one finds 

 among the Alastor some types corresponding with the Odynerus, 

 reproducing the same modifications of form. 



The genus Alastor in effect offers, like the genus Odynerus, 

 types of the metathorax angulated or blunted, with ridges tren- 

 chant or without salient borders ; types with a suture on the first 

 abdominal segment or without suture, and forms the most varied, 

 appear also in the shape of the first segment. 



These insects present themselves as if forming a series parallel 

 to the Odyneri, of which the diverse varieties of form seem to 

 be almost born of similar types, taken from the series of Ody- 

 nerus, types which are changed by the modification of the alary 

 venation. 



In this genus, as in all others, one finds transitions to neigh- 

 boring genera. The second cubital cellule sometimes becomes 



