yi 



HYMENOPTERA 6o^i» 



APOIDEA. 



Fam. PROSOPIDAE. 



Nesoprosopis Perkins. 



Nesoprosopis Perkins, huj. op. i. p. 75. 



I have made a dichotomous table for distinguishing the numerous species of this 

 large genus. The females I am unable to tabulate at present. Unfortunately one 



species N'. nivalis, of which the male is known, was omitted in the table. It would ' 



there be identified as N. anthracina, from which it is at once distinguished by the ' 



unusually long hairs clothing the front of the head and the thorax and the yellow base 

 to the hind tibiae. 



Another species, N. ci'abronoides, was not known to me in the male sex, when I 

 made the table, but I have since taken it numerously at Kilauea, the only known ) 



locality for this remarkable little insect. It may be included in the followine manner : 



20. Prothorax with yellow marking 20a. ' 



Prothorax without yellow marking 23. 



20a. Hind tibiae widely yellow at the base but the tarsi entirely dark N. crabronoides. 



Hind tibiae or tarsi or both otherwise coloured 21. 



Synopsis of Nesoprosopis $$. 



1. Genital armature with the stipites produced so that in dorsal aspect they 



extend far behind the apex of the sagittae, more or less membranous 

 apically and forming an apical (often blunt) angle at the end of their inner 



margin, this apical part being n. ^re or less deflexed 2. 



Genital armature usually with the stipites hardly or not at all extending 

 beyond the apex of sagittae in dorsal aspect, their apex well rounded not 

 forming an angle inwardly with the inner margin and not membranous ...5. 



2. Posterior tibiae not distinctly whitish or yellow at the base 3. 



Posterior tibiae white or yellow at the base 4. 



3. Stipites of genital armature fringed with hairs right to the apical inner angle ...N'. simplex. 

 Stipites with hairs on their outer margin, which become very short and incon- 

 spicuous or altogether fail near the apex N. facilis. 



4. Process of eighth ventral segment with long bifurcation at apex; face not very 

 wide N. chlorostida. 



Process of eighth segment without long apical bifurcation ; face very wide N. hirsutula. 



5. Second segment of the abdomen without a definite puncturation and never 

 with a distinct metallic reflection, species rarely large 6. 



Second segment evidently punctured or with a metallic reflection ; species 

 large 37- 



6. Process of eighth ventral segment linear or sublinear, not dilated ; face below 

 the antennae never with three widely separated yellow spots 7. 



Process of eighth ventral segment nearly always dilated, at least expanded at 

 its flexure; or if not dilated the face below the antennae bears three 

 widely separated yellow spots • lo- 



