DESCRIPTIONS OF GENEBA AND SPECIES. 215 



HlSTIOSTOMA SPINIFERUM,* n.S. PL IV, figS. 1 3. 



Length about ..... '260 mm. 

 Breadth about . '075 



I regret to say that I cannot give as perfect a descrip- 

 tion as I should desire of this remarkable unde scribed 

 species, for I only found one adult specimen and one or 

 two immature, and I have not ever been able to find it 

 again. It is easily known by the long narrow shape 

 and the great length of the curved notogastral spines. 



Colour transparent white or light yellowish brown ; 

 rostrum and legs pinkish. 



Texture dull, slightly granular. 



Form oblong, long and narrow. 



Female (fig. 1). Gephalothorax very long, rostrum 

 rather clearly marked off from the remainder of the 

 cephalothorax ; central portion of the cephalothorax a 

 truncated cone ; posterior portion thereof with a con- 

 vex lateral outline. Flagella of the maxillary lip not 

 above half as long as the width of the abdomen. No 

 spines on the cephalothorax. Abdomen square 

 anteriorly, but ending in a point posteriorly ; the 

 portion which forms the hind margin has curved 

 sides. On the notogaster, somewhat within the lateral 

 margin, are two longitudinal rows, each of four large 

 mammillary elevations with slightly chitinized tips ; each 

 of these bears a vert/ long curved spine ; those on the 

 two anterior pairs, when measured along the arcs of 

 their curves, are nearly as long as the length of the 

 abdomen ; they are directed outward and curve back- 

 ward in a single curve ; the third pair are about one- 

 third shorter, are directed backward and outward, but 

 curve inward ; the fourth pair are much the longest, 

 about half as long again as the abdomen ; they are 

 directed backward and curve outward in a double 

 curve (line of beauty). The posterior pair of mammil- 



* Spinifer, bearing spines. 



