422 Materials for a Monograph 



again as long, and only equals in length the pro- and 

 mesothorax together; hind edge of the seventh segment 

 straight, but curved backwards somewhat at the outer 

 angle ; segments nearly uniform in length along the median 

 line. The eyes are of moderate size, uniform with the 

 surface of the head, nearer to one another than in Crypto- 

 cercus, pyriform,'the broadest portions toward one another, 

 the longitudinal diameter lying in the plane of the head ; 

 the antennae are slender, not exceeding half the length of 

 the body; the first joint not large, swollen at tip, and 

 twice as long as the second, which with the succeeding is 

 cylindrical ; the third is as long as the first, and equals the 

 succeeding four in size; all the joints are covered with 

 very short hairs ; the thoracic segments much hollowed 

 below, giving space for the legs, which may be packed so 

 closely as not to appear above the plane which unites the 

 edges of the segments. Legs similar in every respect to 

 those of Cryptocercus, except that the tibiaB are more flat- 

 tened ; and there is a distinct though small pad between the 

 claws. The supraanal and the subgenital plates, which are 

 exactly similar in character, are thrice as broad as long, 

 regularly curved behind, with a slight fissuration in the 

 middle, making them slightly bilobed ; the cerci are very 

 small but stout, pointed, flattened, with a medial ridge, 

 nearly as broad at base as long, smooth, without trace of 

 annulation ; the styles are slender, cylindrical, bluntly 

 pointed, of about the length of the cerci and inserted just 

 within them. 



* 1. P. OBSCURUS, nov. sp. 



Of an uniform reddish brown above and below, shining 

 upon the whole surface with the exception of the upper 

 surface of the abdominal segments succeeding the third ; 

 head, thorax, and first three abdominal segments above 

 with minute and distant punctures ; upon the dulled sur- 

 face these are exchanged for minute raised points, irreg- 



