Vol. Xxiv] EXTOMOLOGTCAL NEWS. 73 



Two new Otostigmi from India (Myriop.). 



By Ralph \'. Chamberlix, University of Pennsylvania, 

 Philadelphia. 



The two new species of Otostigmiis here described may 

 readily be distniguished from the other known species of the 

 genus bearing spines upon the prefemur of the anal legs by 

 means of the following key. In this key only the more closely 

 related forms are actually taken up ; but it is constructed so as 

 to eliminate all others. 



a. Dorsal plates margined from the 21 st segment cephalad at least to 

 the eighth, 

 b. The three proximal articles of the antennae glabrous or nearly so. 

 c. Ventral plates without true longitudinal sulci ; at most with shal- 

 low furrows or pit-like depressions, 

 d. Last ventral plate with the sides parallel and the caudal mar- 

 gin convexly rounded ; ventral plates with eight impressions, 



O. cuneiventris Poc. 



dd. Last ventral plate with sides converging caudad and the 



caudal margin straight or incurved. 



e. Prefemur of anal legs without a corner spine at distal end 



above ; ventral plates with two median depressions, one 



caudad of the other O. ccylonicus Haase 



ee. Prefemur of anal legs with a well developed corner spine; 

 ventral plates with a pair of depressions lying one each 

 side of median line and a small median depression at 



caudal margin O. simplex sp. nov. 



bb. Only the 2 1-3 to 2 1-2 proximal articles of the antennae glabrous. 

 c. Dorsal plates, excepting at most the first seven, bearing from 7 

 to 9 longitudinal keels which are serrate or tuberculate. 

 d. At most the first 7 pairs of legs with two tarsal spines, the 

 others with i, or 20th and 21st with none. 

 e. Articles of antennae 21 ; sulci of sternites weak, developed 

 only on anterior 1-3 or 1-2 of plate; 20th legs with no 

 tarsal spine. O. scaber Pocock. 



ee. Articles of antennae 17; sulci of sternites strongly develop- 

 ed, crossing the entire plate; 20th legs with a tarsal spine. 



O. amballae sp. nov. 



dd. First 18 pairs of legs with two tarsal spines. Head and first 



dorsal plate chestnut, with the other dorsal plates bluish 



green O. i>tsulans Haase. 



