868 APPENDIX C. — INSECTS.* 



incurved. Thorax convex in front, with piliferous punctures, 

 brown, and pilose ; wings very pale dusky, translucent, nervures 

 pale yellowish-brown. Feet slender and short, anterior tarsi 

 medial line narrow and impressed ; sides and feet dark reddish, 

 curved at the base, the outer side being parallel with the internal 

 excavation ; anterior tibial spine curved, and rather robust, poste- 

 rior feet not reaching the end of the abdomen. Peduncle of the 

 abdomen black above, pubescent, transversely quadrangular, the 

 anterior angles rounded. Abdomen compressed, thinly clothed 

 with fulvous hair. Length five, expanse nine and a-half, posterior 

 tarsus one line. 



Labidus melshaemeri, Hald. 



Pl. IX. Fia. 7-9. 



Pale polished amber-coloured and pilose ; head nearly quadrate, 

 with the vertex black ; the two posterior stemmata are distant, 

 being nearly in contact with the eyes ; mandibles pilose, sickle- 

 shaped, curved from the base and diminishing rapidly to a slender 

 incurved point. Wings very pale dusky, with the nervures pale 

 brown ; a black point upon the thorax at their insertion. Base of 

 the anterior tarsi slightly curved ; anterior tibial spine small and 

 slightly curved ; posterior feet not extending beyond the abdomen. 

 Abdominal peduncle pilose, transverse, basal angles strongly 

 rounded, apex concave ; abdomen compressed. Length about 

 three and a-half, wing three lines. 



Ammophila aberti, Hald. 



A large black and rufous species, the head and anterior wings 

 of which are wanting in the only specimen collected. Thorax 

 black cinereous primrose ; patagia and feet (except the coxae and 

 trochanters) rufous ; basal half of the posterior femora black, which 

 extends in a line toward the apex upon the upper side ; posterior 

 tibial with the inner side darker than the outer side ; posterior 

 wings hyaline, nervures rufous. Abdomen rufous, peduncle and a 

 blotch upon the apex above, black. Length fourteen, abdomen 

 nine, to the constriction four lines. General form of Ammophila 

 sahulosa. Named after Colonel Abert, chief of the Topographical 

 Bureau, for his efforts toward the development of the natural 

 history of the country, under various exploring expeditions. 



