HYMENOPTERA 47 



punctured, with the minute system of punctures between these larger ones very 

 distinct. Propodeum smooth and shining, hardly punctured. Abdomen shining, 

 basal segment remotely punctured ; second not raised from the base except by its 

 longitudinal convexity, which is strong ; beneath, with extremely short costae, the 

 basal portion of the segment in front of these very greatly developed, tumid and 

 shining ; beyond the costae the segment is nearly flat, not at all raised from their 

 apices, and without any definite depression. 



Hab. Molokai mountains (3000 ft.), i </ taken. 



^2)'^ Odynerus eupteryx, sp. nov. 



(/ praecedenti simillimus, niger, mandibulis atque clypei apice rufis, alls caeruleo- 

 iridescentibus. Clypeus levissime emarginatus. Frons opaca, puncturatione fere 

 obsoleta. Mesonotum opacum subobsolete punctatum. Propodeum dense minutissime 

 rugulosum, opacum, fere impunctatum. (/. Long. 7^ mm. 



Closely allied to the preceding, having the second ventral segment of the abdomen 

 very similarly formed, but with the costae rather longer and the tumid basal portion 

 of the segment less shining. Otherwise it may easily be distinguished by the following 

 characters. The extreme apex of the clypeus is red, as well as the mandibles, the 

 head above the antennae is very obscurely punctured, the thorax quite dull, the larger 

 system of punctures very feebly impressed, and the minute system much less distinct. 

 The propodeum dull, with a very minute and dense surface rugulosity. The wings 

 are darker with a bright blue iridescence. 



Hab. Molokai mountains (3000 ft.), i i taken. 



(34) Odynerus purpurifer, sp. nov. 



Niger, nitidus, mandibulis clypeique apice rufis; alls fuscis, purpureo-iridescentibus. 

 Clypeus dentato-emarginatus. Mesonotum nitidum, subtilius minus dense punctatum. 

 Propodeum nitidum, sparsim subobsolete punctatum. Abdominis segmentum secundum 

 (praecipue </) subelevatum ; subtus, post sulcum transversum fortissime elevatum, costis 

 subobsoletis. c/'?. Long. 7— 11 mm. (Plate I. fig. 25 and 25a.) 



Black and shining, the mandibles and apex of clypeus red, wings shining fuscous 

 with purple iridescence. Head above the antennae closely and distinctly punctured, 

 the vertex in the ? somewhat incrassate. Mesothorax with scattered punctures, the 

 surface between them with the minute system very distinct, but not dense. Propodeum 

 in front shining, with a few feebly impressed punctures. Abdomen with the basal 

 segment not densely punctured ; second raised from the base in the c/, but not strongly 



