Vol. XXX] ENTOMOLOGICAL NEWS. IO7 



corded so far north, and by the shape of the appendages which 

 were fully expanded within the abdominal skin, as good for- 

 tune had let this be a male. The following is the descrip- 

 tion : 



Total length 65 mm., abdomen 44 mm., hind femur 8 mm.; width of 

 abdomen 10 mm. 



Body elongate, slender, smooth ; a narrow sharply defined stripe 

 down the middorsal line of the abdomen, a lateral stripe twice the 

 width of the dorsal stripe above each lateral keel ; legs probably ob- 

 scurely banded in life. 



Head slightly concave behind, its posterior margin being a thin edge ; 

 the hind angles are almost right angles, obtuse but well defined and 

 not rounded, neither do they carry any spines or other armature : sides 

 of head straight, diverging cephalad slightly, three-fifths as long as the 

 eye. The labium is missing, but from the very flat under surface of 

 the head it is wide anteriorly and from the shape of the submentum 

 extends at least posterior to the first coxae. Antennae seven-jointed, 

 minute. 



Prothorax with the median lobe terminating laterally in a prominent, 

 obtusely romided point which is larger than either supracoxal process ; 

 posterior supracoxal process more than twice the size of the anterior 

 one, its point rounded. In life probably the hind wing pads extend 

 to the apex of abdominal segment 3. The legs are noticeably small 

 for so large a naiad because when these are extended the claws of the 

 hind leg reach only to the middle of segment 5. 



Abdomen widest at segments 5-7. whence it tapers regularly 

 cephalad to segment i, which is two-thirds as wide, and caudad to 

 segment 10, which is one-half as wide. Segment 10 is one-half as long 

 as either segment 5 or segment 6. There are lateral spines on seg- 

 ments 6-9, but all are small, slender and acute, those on segment 6 

 being minute and easily overlooked. The superior appendage and 

 ventral paired appendages are equal in length and two and one-third 

 times as long as segment 10. The dorsal paired appendages are sub- 

 equal to the others and very slender. The superior appendage is slen- 

 der, widely cleft at the apex and has a single, dorsal tubercle directed 

 caudad placed at one-third of the distance from base to apex. 



This naiad resembles those of the genus Acshua in the ma- 

 jority of its characters, especially in having lateral spines on 

 segments 6-9 and in having a single tubercle on the superior 

 appendage of the male. It diflfers from the known naiads of 

 the North American Aeshnas in having the dorsal paired ap- 

 pendages with their length scarcely less than that of the others 



