HYMENOPTERA 



19 



largely and rugosely punctured. Wings of the </, and often of the ? with blue 

 iridescence. 



Hab. Both mountain ranges of Oahu ; Molokai, Lanai and Maui. Examples 

 (at least of the ?) from Oahu appear to have a less distinct blue iridescence on 

 the wings than those from Molokai &c. 



Crabro (Solenius) tumidoventris var. leucognathus. 



Forma praecedentis, i mandibulis, ? mandibulis, antennarumque articulo basali 

 antice albis ; abdomine nonnunquam albo-notato. 



This form on Hawaii corresponds to C. tumidoventris on the four islands named 

 above. A single % from Oahu appears to hardly differ from the Hawaii form, and a 

 few a from Maui are somewhat intermediate. For the most part, (and I have 

 examined many of both forms) the two are readily distinguished. The variation of 

 the var. leruognathus appears to be very different to that of the typical form, since 

 in the d" the abdomen not infrequently is spotted at the sides of the 5th and 6th 

 abdominal segments, (or on one of these), and rarely also on the 2nd segment ; 

 one ? has small lateral whitish spots on this segment, and on the 4th, and an 

 interrupted band on the 5th. 



Hab. Island of Hawaii ; Kona (2000 — 3000 ft.) ; Kilauea (4000 ft.) ; Olaa 

 (2000 ft.). 



(7) Crabro {Solenius) affinis. 



Crabro affinis, Smith, J. Linn. Soc. xiv. p. 677 ; Blackburn and Cameron, P. 

 Manch. Soc. Vol. xxv. (1885—86), p. 165. 



Niger, alis subhyalinis, abdomine plus minusve flavo-notato. </ clypeo argenteo- 

 piloso, antennarum articulo sexto baud fortiter dentato ; ? clypeo aureo-piloso, 

 antennarum articulo basali antice, mandibulisque plus minusve flavescentibus. c/?- 

 Long. 6'5 — II mm. (Plate L fig. 8.) 



Male with the scape of the antennae and mandibles dark, in the ? they are 

 more or less yellowish. Abdomen in the ,?, with the 2nd, 4th, and 5th, rarely the 

 3rd, with pale markings. Sometimes these markings form entire bands, or they 

 may be reduced to lateral spots. Female with a band on the 2nd, 4th, and 5th 

 segments, often similarly reduced in size, those on the 2nd and 5th sometimes wanting, 

 so that probably an entirely black variety may be found. 



Male, clypeus clothed with silvery hairs ; antennae with the 5th joint of the 

 flagellum emarginate beneath, very little produced at the apex, beyond the base of 



3—2 



