HYMENOPTERA. 263 



finely punctured, and thinly covered, as well as the cheeks, with 

 long cinereous pubescence. Thorax : the mesothorax and scu- 

 tellum shining and evenly punctured ; the metathorax opake and 

 rather finely rugose ; the thorax, coxae and femora, as well as 

 the petiole of the abdomen, thinly covered with erect cinereous 

 pubescence ; wings fusco-hyaline, the apical margins, as well as the 

 anterior margin of the superior pair, with a darker fuscous cloud; 

 the petiole as long as the two basal segments of the abdomen ; 

 the latter has a slight chalybeous tinge, and in some examples the 

 apical margins of the segments are more or less pale testaceous. 



Hab. East Florida uSt. John's Bluff); Georgia. 



103. SPHEX FLAVIPES. 



Female. Length 13 lines. Black : the face densely clothed 

 with golden pubescence ; the basal half of the mandibles ferru- 

 ginous ; the labrum has a central longitudinal carina, its apical 

 margin is rounded. Thorax opake ; the posterior margin of the 

 prothorax, the hinder margin of the tubercles, an epaulet over 

 the tegulae, the post-scutellum and apex of the metathorax. 

 covered with short bright golden pubescence ; the metathorax is 

 thinly clothed with yellow pubescence ; the wings dark fuscous ; 

 the tibiae, tarsi and knees of a reddish-yeilow, the spines of the 

 same colour. Abdomen opake, covered with a fine reflective 

 silky pile. 



Hab. Georgia. (Coll. F. Smith.) 



This species resembles the Sphex tibialis of St Fargeau, but 

 that insect has fuscous pubescence on the head and thorax, and 

 the spines on the legs are black. 



104. SPHEX INSTABILIS. 



Female. Length 9 lines. Black : the face covered with pale 

 golden pubescence, and sprinkled, as well as the cheeks, with 

 longer pale pubescence; the mandibles ferruginous at the base. 

 The pro- and mesothorax above are covered with a fine golden 

 pile ; the metathorax clothed with pale golden pubescence, the 

 apex densely so; wings yellow-hyaline, the apical margins of the 

 superior pair have a broad dark fuscous border, the apex of the 

 inferior pair faintly clouded, the nervures pale testaceous ; the 

 intermediate and posterior tibiae and tarsi fusco-ferrugiuous ; in 

 some examples they are bright ferruginous, as well as the poste- 

 rior femora. The abdomen covered with a fine silky pile ; in 

 some examples the petiole is ferruginous. 



Hab. North America. 



