HYMENOPTERA 105 



species, the prothorax, the mesothorax at the sides and the propodeum wholly or 

 in part being generally red or reddish. 



Hab. Mountains of Kauai (3000 — 4000 ft.) in various localities. Parasitic on 

 N. laeta, and probably other species. 



(40) Nesoprosopis volatilis. 



Prosopis volatilis, Smith, J. Linn. Soc. xiv. p. 683. Blackburn and Cameron, 

 P. Manch. Soc. xxv. (1885-86), p. 148. 



Closely allied to N. hostilis but duller. In the </ the yellow colour is less widely 

 produced along the eyes behind the antennae ; the scape of the antennae is coloured 

 like that of N. hostilis, but the pale colour is often much diminished, and sometimes 

 absent in Oahuan specimens, which are in general duller, and have the yellow markings 

 more clouded, or reduced in size, than examples from Molokai and Lanai. The ? 

 has the face below the antennae red without yellow markings ; the intermediate and 

 posterior trochanters are of an obscure colour, or quite black. The wings in both 

 sexes are less clear than those of A', hilaris, and the margins of the abdominal segments 

 are without a fringe of pubescence. Length 5 — 8*5 mm. 



Hab. Oahu, Lanai. Molokai and Maui, both on the coast and in the mountains 

 — as high up as 8000 ft. on Haleakala. I have taken remarkably large specimens at 

 Waianae, Oahu, in company with N. assiviulans var. oalmensis — a large species— on 

 which no doubt they were parasitic. It also attacks N. facilis, N'. difficilis, and other 

 species. 



(41) Nesoprosopis sphecodoides, sp. nov. 



Praecedentibus afifinis, </ abdomine toto nigro, vel nonnunquam segmento basali 

 plus minusve obscure rufo vel piceo, antennarum articulo primo nigro ; ? capite prae 

 antennis toto nigro distinguenda. Long. 5 — 7 mm. 



Male, with the abdomen entirely black, or with the basal segment sometimes 

 more or less obscurely reddish ; clypeus with a yellow spot extending from its base 

 to about three-fourths of its whole length, and outside it there is a triangular 

 spot on each side of the face ; these spots are separated by more or less black 

 between them, and they are variable themselves, being much reduced in size in 

 some examples; scape of the antennae entirely black. Superficially the d" bears a 

 close resemblance to some of the non-parasitic species, but the inconspicuous pubescence 

 of the front of the head above the antennae, the closely punctured scutellum, and the 

 p. F. H. 14 



