66 a Mr. R. V. Chamberlin on new 
anterior gonopod, the distal end lying at the mesal line in 
the genotype; twisted, the end expanded into a plate that 
lies caudad of the outer border of the anterior gonopod. 
Repugnatorial pores beginning on the sixth segment 
nearly in line with the sutures, but the latter curving well 
away from them. 
Prozonites with numerous transverse striations, excepting 
caudal portion, which is roughened with puncte and chiefly 
longitudinal impressed lines. Metazonites below with deep 
longitudinal strize, smooth above. 
Ventral plates smooth. | Pits of spiracles short, less than 
twice as long as wide, exceeding the lateral end of the 
ventral plates, but much less so than in Thyropygus. 
Fourth and fifth joints of legs in males with pads. 
Cauda cylindrical, pointed, upcurled. Anal valves with 
borders strongly elevated. 
Genotype, G. carltoni, sp. n. 
Gonoplectus carletoni, sp. n. 
At present the prozonites are testaceous, with a dark irregu- 
larly edged stripe on each side extending from the lower part 
of the side dorsad beyond the pore to a point half-way 
between the latter and the mid-dorsal line. The metazonites 
brown. Legs brownish, distally dusky to nearly black. 
Antenne reaching to near the end of the third segment. 
Vertex of head caudad of the transverse suture, strongly 
longitudinally ribbed. Median sulcus fine. Head mostly 
smooth; punctate in clypeal and labral region. Labral 
setigerous foveolate3+2. Teeth in labral sinus three, these 
rounded. 
Collum strongly narrowed down the side, margined below 
and in front up to the level of the eye, the thickened border 
especially broad at the anterior corner. Above the lower 
margining sulcus two parallel sulci from caudal border 
forward, and in front behind the anterior margining sulcus 
many oblique and irregular striations. 
Anterior median plate of gonopods with median or distal 
arm broader than the lateral ; sides convex, converging distad 
to a narrowly rounded apex. The inner piece of the anterior 
gonopods strongly clavate to about distal third, the latter 
triangular. At outer edge of base of this triangular part 
arises a short, distally blunt, flat process that curves ecto- 
caudad. The posterior gonopod from point of origin of the 
long, mesally curving spur runs directly proximad, flexing 
weakly sigmoidally and expanding into a plane; at end 
