Injurious and Beneficial Insects. 31 



Academy of Science, found the pupa (PI. 1, fig. 10) of Cordulia 

 lateralis Burm., and reared from it the dragon fly, which was 

 kindly identified for me by Prof. Hagen, of the Museum of Com- 

 parative Zoology at Cambridge. This pupa may serve as a type 

 of the larval form of this genus. 



Tiie body is broad and somewhat flat, the abdomen ending in 

 two rather long spines. The head is somewhat triangular when 

 seen from in front, and the eyes are rather large, though not so 

 prominent as in the next species figured. The occipital region 

 is rounded and smooth behind. The antennae are seven-jointed, 

 the two basal joints being thick, the remaining ones hair-like, 

 and all of the same thickness. The space between the antennas 

 is smooth. The mask, or labium, is full and convex, reaching 

 further up the front, and nearer the base of the antennae, and 

 the teeth along the edge are small, blunt, and do not interlock. 

 The thorax is scarcely wider than long, and the rudimentary 

 wings extend to the fourth abdominal segment. The abdomen 

 is scarcely twice as long as broad ; along the back is a median 

 row of compressed spine-like processes projecting backwards. 

 It is of a pale horn color, with a row of round lighter spots on 

 each side of the abdomen, while the legs are banded with paler, 

 and on each side of the thorax is a dark stripe. It is .80 of an 

 inch in length, and .28 inch broad. 



With this may be compared the pupa of another dragon fly, 

 Didymops ? (PI. 1, fig. 11), in which the head is square above, 

 and the eyes are very small and projecting, adding to the angular 

 appearance of the head. On each side at the base of the occiput 

 is a blunt tubercle, and between the'antennoe is a large triangular 

 tubercle which is thin and up-curved, reaching to the end of the 

 second joint of the antennee. The teeth of the labium are large, 

 triangular and interlock. The wing covers are long, and the 

 upper pair extend to the end of the fifth segment of the abdomen. 

 The legs are long, the tarsal claws are scarcely curved, and are 

 remarkably long and slender, Ijeing nearly half as long as the 

 tarsus itself. The abdomen is much flattened, nearly as broad 

 as long, with a median row of dorsal, short, compressed, hook- 

 like tul)ercles. The eighth abdominal segment ends in a pair 

 of short spines. The creature is of a dark horn color, and is 

 an inch long and half an inch wide. 



Peabody Academy of Science, ) 

 Salem, Jan. 20, 1871. ) 



