16 bulletin: museum of comparative zoology. 



Dorsal plates without trace of keels or roughening; densely marked 

 with exceedingly fine puncta. Antennae long, composed of twenty 

 articles of which the first two are glabrous and the third glabrous at 

 proximal end ventrally. Dorsal plates from fifth on with complete 

 paired sulci, those of the fourth complete excepting at middle. Ter- 

 gites from eighth caudad margined. Last tergite depressed just in 

 front of angle, the furrow not evident on anterior part of plate. Ven- 

 tral plates with paired sulci deep and complete. Last ventral plate 

 only slightly narrowed caudad, the sides being nearly parallel ; caudal 

 margin widely incurved. Coxopleural processes each with two spin- 

 ous points at tip; just cephalad of these on ectal side a spinule and one 

 farther removed at base of process, and a single dorsal spine. Femur 

 of anal legs toward ectal side beneath with a series of four spines; 

 toward mesal edge beneath two spines; mesal surface with five teeth, 

 three in a more ventral series and two in the dorsal; one spine at 

 distomesal corner above. 



Length, 50 mm. 



35. Otostigmus pamuanus, sp. nov. 



Type.— M. C. Z. 2,112. Solomons: Pamua (W. M. Mann). 



Color deep olive, the legs more greenish. 



Antennae composed of twenty-four articles of which two and a third 

 are glabrous. Dorsal plates with complete paired sulci beginning 

 with the fifth. Tergites margined beginning with the ninth. Ter- 

 gites with a rather narrow, low and flat median keel and some with 

 one or two lateral ones on each side more or less obscurely indicated, 

 the surface in part sparsely scabrous. Each prosternal dental plate 

 with three large teeth of which the median and outer one are weakly 

 incised or subdivided, the outer one in consequence showing a much 

 smaller denticle at base on ectal side. Most ventral plates without 

 paired sulci or these evident only at anterior border; however, a few 

 in anterior part of posterior region have the sulci extending to middle or 

 entirely across plate. Last ventral plate scarcely narrowed caudad, 

 subquadrate, lateral margins weakly incurved as is also caudal mar- 

 gin, the corners rounded. First three pairs of legs with two tarsal 

 spines, the others to the twentieth with one. Coxopleural processes 

 short; with two spinous points at apex; two lateral spines, one close 

 to apical ones, the other near middle; one dorsal spine. Femur of 

 anal legs with numerous spines; ventrally an outer row of seven spines 

 with several adjacent smaller spines or points; toward mesal edge on 



