552 



The latest introduction of these bees turns out to be Mega- 

 chile fiillaivayi, which Dr. Cockerell described from Guam as 

 late as 1914, but it is likely that the species was brought by 

 commerce to these islands from some other part of the Oriental 

 region, as our communications with Guam are not extensive. 



The conclusion that all of our MegacliUe are immigrant 

 species is therefore supported by the fact that three of the five 

 species have been found elsewhere. 



Table of Hawaiian Megachile. 



Females •'^ 



Males 1 



1. Front coxae armed with a distinct strong spine. 2 



Front coxae with a very small or rudimentary spine; pubescence 



short, fulvous on thorax above and on the first tergite of abdomen. 



M. schauinsJandi Alfken 



2. Basitarsus of front legs simple 3 



Basitarsus of front legs with a deep longitudinal furrow beneath ; 



abdomen with dorsal and ventral apical hair-bands pale to rather 

 deep ochreous M. fullaivaiji Cockerell 



3. Basitarsus of front legs narrow or not more than twice as wide as 



the apical joint of the tarsus . -1 



Basitarsus of front legs about three times as wide as the apical 

 joint of the tarsus, its apex truncate and only slightly oblique; 

 pubescence on abdomen deep fulvous M. diligens Smith 



4. Front tarsi comparatively thick, the basal joint triquetrous, flat- 



tened above, the apex truncate and then produced at the anterior 

 corner into a point overlapping the second joint, its ventro- 

 anterior surface covered with dense semi-erect reddish hair on 

 either side but leaving a central, narrow longitudinal bare line; 

 thorax with erect, not very long, pvibescence above, mostly white 

 or pale yellowish, but intermixed with brown or blackish hairs on 

 the disk of the mesoscutum; apical keel of the 6th tergite of 



abdomen deeply emarginate. M. palmarum Perkins 



Front tarsi slender, the basal joint more nearly cylindrical, the 

 ventro-anterior surface without a bare streak, its apex nearly as 

 in palmarum, but less strongly produced; thorax with short erect 

 pubescence, pale ochreous to rather distinctly yellowish in color, 

 and with short appressed scale-like hairs on the mesoscutum, es- 

 pecially towards its anterior and posterior margins; apical keel 

 of the 6th tergite of abdomen weakly emarginate. 



M. timberlakei Cockerell 



