168 SMITH ON HTMENOPTEBA OF AETJ ISXANDS. 



thinly covered with long yellow puheseence, which is most dense at 

 the sides of the metathorax ; the tibiae, tarsi, and posterior femora 

 ferruginous ; the claw -joint of the tarsi black ; the tibiaj and tarsi 

 with black spines ; the wings fulvo-hyaline, their apex with a narrow 

 fuscous border, the nervures ferruginous. Abdomen covered with a 

 fine, thin, golden-reflecting pile ; the apical margins of the segments 

 rufo-testaceous, the testaceous margin produced in the middle into a 

 triangular shape, most conspicuously so on the segments beneath. 

 Hab. Am. 



4. Sphex NiTiDivENTRis. S. niger ; abdomine nigro-cseruleo, laevi- 

 gato, nitido ; alis fuscis. 



Female. Length 12 lines. Black; the face with silvery pubescence, 

 and thinly covered with long black hairs ; the clypeus with a central 

 longitudinal carina at the base, which terminates at the middle, from 

 whence to the anterior margin is a broad, smooth, shining space. 

 Thorax shining and finely punctured; the metathorax opake and 

 covered with long, loose, black pubescence ; the legs shining, the pos- 

 terior tibiae with shining grey pile within ; wings brown, darkest at 

 their base. Abdomen blue, and very smooth and shining, oblong- 

 ovate ; the apical segment vertical. 



Hab. Aru. 



5. Sphex sepicola. S. niger; facie pube aure^ vestita; alis sub- 

 hyalinis apice fuscis ; abdomine nitido. 



Female. Length 9 lines. Black ; the face densely clothed with golden 

 pubescence, the cheeks with iridescent pile, with a long, loose, scat- 

 tered pale yellow pubescence on the head and thorax ; the mandibles 

 smooth, shining black. The disk of the thorax with an obscure cha- 

 lybeous tint, shining and finely punctured ; the metathorax opake and 

 finely rugose ; the wings subhyaline, their apical margins fuscous, the 

 nervures fusco-ferruginous. Abdomen with a slender subelongate 

 petiole, and with a thin, silky, grey pile ; the apical margins of the 

 segments narrowly and obscurely rufo-piceous. 



Male. Rather smaller than the female, more slender and more pubes- 

 cent, the pubescence on the face paler. 



Hab. Aru. 



6. Sphex gratiosa. S. capite thoraceque nigris, abdomine caeruleo, 

 ahs fusco-hyalinis. 



Male. Length 10 lines. Head and thorax black; the face densely 

 clothed with pale golden pubescence; the labrum and mandibles 

 highly polished, very smooth and shining ; a thin pale pubescence is 

 scattered over the head, pro- and mesothorax, the latter obscurely cha- 

 lybeous above, shining, and finely and closely punctured, with an abbre- 

 viated, deeply impressed line in the middle anteriorly ; the posterior 

 margin of the prothorax covered with shining silvery pubescence ; the 



