210 



THE MYKIAl'ODA OF NORTH AMERICA. 



inner basal piece, alluded to, there exists a large, strongly-curved, acute hook or claw, 

 whose distal extremity is subcylindrical. The female appendages are small, and are com- 

 posed on each side of a very thin plate and a process about a line in length, proximally 

 irregularly prismatic in shape 1 ; but distally excavated suddenly, so as to be flattened for 

 the remainder of its course. 



Ilul,. California. — Smithsonian Institution. 



S. ANGUSTICEPS. 



S. niger, lateribus brunneo maculatis; capitis supcrficic antica angusta, longa, supra nigra, infra albido-brunnea ; 

 antennis ? ; segmentis 75; scutis et infra et supra distincte canaliculatis ; squama anali triangula. 



Black, with the sides maculate with brown ; anterior surface of the head narrow, long, above black, below 

 whitish brown; antennas ? ; segments 75; scuta both above and below distinctly canaliculate; anal scale trian- 

 gular. 



S. angusticeps, Wooil, Proc. Acad. Nat. Sei., 1 S 04 , p. 16. 



The color of this species is black, with a brown band on the sides, in which is a black 

 dot marking the position of the lateral pores. The lower portion of the head is very 

 light-brown, and is rather deeply emarginate. Along the posterior cephalic border is a 

 somewhat crescentic area, which is nearly smooth and is medianly canaliculate ; adjoining 

 this the surface suddenly is rudely punctate, but gradually becomes smoother. The eyes 

 are arranged in three transverse rows, the posterior being much the longer. The first 

 sent urn is copiously coarsely punctate, and is posteriorly slightly canaliculate on the dor- 

 sum, but distinctly so on the sides. The lateral processes, even in the female, are obsolete, 

 the second scutum being produced forwards so as to abut on the head. The posterior 

 subscuta are on the dorsum closely, rather deeply, and more or less obliquely canali- 

 culate, but on the sides less distinctly and more distantly so. The anterior subscuta 

 are very distantly and much more lightly and obliquely canaliculate, and are also pore 



closely channelled below tlitui above. The surface 

 of the anal scutum is irregularly and minutely cor- 

 rugate. I have seen but one imperfect specimen — 

 a female. The female (Fig. 37) appendages appear 

 to consist of two conoidal bodies coalescing at their 

 bases and united together towards their apices by 

 a broad plate, so placed as to present towards them an inclined surface. Into the base 

 of these pyramidal processes fit other somewhat prismatic bodies (Fig. 37 n), with their thin 

 edge formed of several pieces. Length, 4iS inches. 

 Uab. San Francisco. — Smithsonian Institution.^!!. I'. Cutis. 



Fig. :;: 



