1915] Johnson — Tivo New Species of Borboridae 21 



the mesothorax, the upper mark, however, is not so dark in color as on the preced- 

 ing segment and bears more setae, which are less circular in arrangement. The 

 venter differs from that of the mesothorax, only in having the chitinous areas near 

 the caudal margins darker in color. The front leg. Fig. II, is little more than half 

 the length of the succeeding legs, but is more robust. It bears three stout spiu-s on 

 the inner angle next to the tarsus and one isolated spur on the distal margin. On 

 the inner margin of the basal segment of the tarsus there is a single row of short 

 stout spines. The inner surface of the tibia bears numerous very short spines. 

 The inner surface of the femur is sparsely armed with short triangular teeth. The 

 coxa, on its inner margin, has a few short spines and over its entire surface has rows 

 of fine, short hairs like those described for the frons. The two succeeding legs 

 (Fig. 1^2 shows the hind leg), differ from the front leg in being longer and less robust 

 and in having fewer and weaker short spines. Each of these legs has but one tibial 

 spur. 



The Abdomen is cylindrical and almost uniform in circumference throughout its 

 length. The humps on the first segment are not greatly developed. The lateral 

 humps bear an area of short curved spines whose points are directed forward. The 

 gills are distributed on segments 2-8, above and below the lateral line, as diagrammed 

 in Fig. 10. The lateral line, near the caudal margin of the seventh abdominal seg- 

 ment, ends at the beginning of a fleshy raised line. Fig. 16, which crosses the suture 

 between the seventh and eighth segment and, inclining upward, extends to the 

 caudal margin of the eighth segment. Each side of this fleshy line is armed with 

 curved, bifurcate spines directed backward. The anal hooks and the arrangement 

 of setae on the last abdominal segnaents are shown in Figs. 16 and 17. 



Pupa: Length, 13 mm. Mandible Fig. 20. Tarsi flattened and fringed on each 

 side by a row of black swimming hairs. Lateral line black. A narrow black line 

 parallels the lateral line beneath, to the caudal margin of the eighth segment, where 

 the two converge. A narrow black line above the lateral line contains the spiracles. 

 Abdominal segments 2-9 with paired tufts of hair near their caudal margins above. 

 On the caudal margin of the first abdominal segment there is a pair of lobes. Fig. 18, 

 covered with sharp spines. Above these lobes are sparse backward-pointing teeth. 

 The chitinous plates of the abdomen are shown in Fig. 18. The posterior end of 

 the pupa is represented in Fig. 19. 



TWO NEW SPECIES OF BORBORIDAE. 



By Charles W. Johnson, 



Boston Society of Natural History, Boston, Massachusetts. 



Leptocera frosti sp, nov. 



Female: Shining black. Front broad, face light brown, vibrissse large, with a 

 row of six smaller bristles extending to the posterior angle of the cheek, above this 

 row near the middle, two prominent bristles, mouth parts and antennae black, 

 second joint slightly longer than the third, arista dark brown, pubescent and 



