HYMENOPTERA. 53 



HYMENOPTERA ACULEATA. 



FOSSORIA. 



Fam. Crabronidae. 



3. Crabro idrieus, sp. nov. 



Niger, mandibulis, scapo antennarum, linea pronoti, basi scutelli, apice femoruin, tibiis 

 tarsisque flavis ; alis hyalinis, stigmate fusco. ^ 



Long. 7 mm. 



Hab. Goidu, Goifurfehendu Atoll, Maldives. 



The scape of the antennae bright yellow ; the flagellum is black, fuscous towards the 

 apex ; it is covered with a white pile and is distinctly thickened towards the apex. Mandibles 

 bright yellow ; the teeth black, with a piceous baud behind them. Front and vertex opaque, 

 the front is strongly, but not very closely, punctured ; the vertex is less strongly and not so 

 closely punctured. The frontal depression, the face and the clypeus, are thickly covered with 

 silvery pubescence ; the face is distinctly keeled in the centre ; at the apex this keel slightly 

 projects and is smooth and shining. 



Pro- and mesothorax opaque, the mesonotum and scutellum are sparsely punctured ; the 

 mesopleurae less distinctly punctured. Propleurae shining ; on the basal half are three or 

 four irregular keels ; on the apex two longish oblique keels, with two shorter ones behind 

 them. The middle of the metaplurae is depressed and is, especially in the middle, obliquely 

 striated. The following are yellow : an inten'upted line on the pronotum, the tubercles, the 

 scutellar keels, two large marks, rounded behind on the base of the scutellum. Abdomen 

 black, except for an oblique, yellow mark on the sides of the second and third segments. 

 The petiole is as long as the second and third segments united ; the base above is flat, 

 shining, and farrowed in the middle at the base ; this part becomes acutely narrowed at 

 the apex. 



The tubercles are fringed behind with white hair ; the part behind them is keeled ; 

 from the top of this keel an oblique smooth furrow runs ; the keel behind the middle is 

 obscurely striated. The " enclosed space " on the base of the median segment is stoutly, 

 obliquely striated ; in the middle at the apex reticulated ; the apical slope on either side 

 of the furrow is transversely striated, the striae becoming weaker towards the apex ; the 

 four anterior tibiae are lined with black behind, the anterior in front. 



Comes nearest to Crabro orientalis Cam. 



4. Crabro viusaeus, sp. nov. 

 Long. 9 — 10 mm. $ 



Hab. Mahlos Atoll, Maldives. 



Similar in coloration to the preceding species, except that the third and fourth seg- 

 ments are lined with black laterally above and with a mark on the sides behind ; it is 

 easily known from it by being longer, by the " enclosed area" on the median segment 

 not being stoutly striated, and by the upper abscissa of the transverse cubital nervure 



