HYMENOPTERA 8i 



area more or less regularly longitudinally rugose ; wings hyaline or subhyaline without 

 blue iridescence ; abdomen without definite puncturation, calcaria testaceous ; legs and 

 the apical segments of the abdomen above and beneath with pale pubescence. 



Hab. Molokai, Lanai, Maui and Hawaii ; abundant in the mountains. This is 

 a most perplexing species on account of its variability. In general appearance and 

 sculpture it greatly resembles N. facilis and the allied forms. The yellow markings 

 of the face in the </ are variable, being sometimes reduced in size, or altogether 

 absent except that of the clypeus, which is always yellow over at least the greater 

 part of its surface. Structurally the </ is quite distinct from the three species first 

 described, by the simply rounded apex of the genital armature, which is not at all 

 produced, and by the differences in the process of the 8th ventral segment. The 

 female may be known by the clearer wings which are without blue iridescence and 

 by the pale pubescence of the legs, and terminal segments of the abdomen. Some- 

 times the abdomen is of an immature reddish colour, as is also the case in other 

 of the Hawaiian species which are normally black, the paler forms being apparently 

 produced when the individuals arrive at maturity after an unusually short period 

 has been occupied in the earlier stages. 



(6) Nesoprosopis laeta, sp. nov. 



Nigra, subnitida, praecedenti simillima, sed mesonoto et scutello subtilissime 

 punctatis et laevioribus ; metanoto minus rugoso ; cT tuberculis pedibusque fere 

 semper flavo-notatis ; antennarum articulo primo fortiter arcuato ; ? tuberculis saepe 

 flavo-notatis, genis brevissimis. c/ ? . Long. 5 — 7 mm. 



Closely allied to the preceding, the yellow markings variable. In the most 

 brightly coloured males the following parts are yellow ; the front tibiae in front and 

 within, the intermediate tibiae inwardly, and the base and apex also outwardly ; the 

 posterior, except for a black spot towards the apex inwardly, and a more or less 

 distinct fuscous stain outwardly ; the basal joint of all the tarsi and sometimes also 

 the apical ones, as well as the extreme apex of all the femora ; the clypeus, the 

 plate above it, an elongate spot on either side, and the tubercles of the prothorax 

 are also yellow. In general the basal joint of all the tarsi, and the base of the 

 posterior tibiae widely, are yellow. Of forty or fifty specimens of the ^ one only 

 has the legs entirely of an obscure colour, and this also has the tubercles black ; 

 while of about a score of the other sex, three or four have the tubercles black, and 

 some of them have the posterior tibiae widely yellow at the base. 



Male with the antennae formed much as in the preceding, the scape being strongly 

 arched beneath, the lower surface of the flagellum pale ; the plate above the clypeus 

 as long to the antennal fossa, as the length of its apical margin, or rather longer ; the 



p. F. H. II 



