62 Journal New York Entomological Society, n'oi. xxii. 



or oval dark orbiculars enclosing yellow centers, except on the ninth, where 

 there are but two of such orbiculars ; a pair of small blackish spots in the 

 depressions at the anterior base of the dorsal hooks on segments two to eight 

 inclusive, midway between each of which and the quadrate dorso-lateral spot 

 is another small dark maculation. 



Antennae with second joint slightly smaller than first; third spatulate, 

 flattened, four or five times as long and more than twice as broad as second ; 

 fourth rudimentary. 



^lentum of labium but little longer than its apical width (3.5 X 3 mm.), 

 widened beyond basal third with upturned edges as in O. aspersus ; median 

 lobe rounded, edged with beading of rectangular castaneous denticles, within 

 which is a fringe of long, flat, white scales ; lateral lobes narrow, incurved, 

 with a slender movable hook castaneous at tip and bearing dense yellowish 

 setae on its outer edge ; the apex of the lobe is a blunt point without terminal 

 hook, its internal margin with a row of about twelve low, rather blunt, teeth. 



Abdomen elongate-oval in outline, widest at fifth segment, not abruptly 

 narrowed on ninth segment ; dorsum of tenth segment one-third shorter than 

 ninth ; lateral abdominal appendages two-thirds as long as the others, the 

 dorsal and ventral abdominal appendages being equal in length with their tips 

 blackish ; lateral spines present on segments seven to nine increasing in length 

 caudad, but on ninth not longer than one-half the length of dorsum of tenth ; 

 dorsal hooks on segments two to nine, erect and blunt anteriorly, posteriorly 

 becoming more and more directed caudad, on the ninth almost attaining the 

 form of a spine, and as in 0. aspersus each surmounting a low transverse 

 ridge ; anterior two-thirds of each segment, including the ridge, with thick 

 dark granulations, posterior one-third shining and smooth. 



Burrowing hooks on fore and middle tibiae strong. 



The nymph of this species has been compared with alcoholic 

 specimens of O. aspersus Morse, and 0. carohis Needham, and differs 

 from them in the following particulars : 



In dorsal aspect it is much more slender in oudine than either, 

 the ninth segment of abdomen is not abruptly narrowed, and the lateral 

 spines are decidedly shorter and smaller. In coloration it is darker, 

 and the maculation, though of same general pattern, much more pro- 

 nounced. From O. carolns it differs further in its more conical, less 

 slender, lateral abdominal appendages; the longer dorsum of tenth 

 abdominal segment ; much larger and more prominent dorsal hooks ; 

 and slightly more slender and darker lateral lobes of labium. Com- 

 pared with O. aspersus, its lateral abdominal appendages are shorter, 

 those of aspersus being very slender and fully three-fourths as long 

 as the dorsal appendage; the granulation of abdominal segments is 

 much coarser; dorsal liooks slightly more pronounced; apex of lateral 



