450 NEW YORK STATE MUSEUM 



Abdomen black with a middorsal line of yellow triangles pointing pos- 

 teriorly, elongate and twice constricted on the basal segments, becoming 

 very short and restricted to the base on several segments before the 

 ninth, and entirely absent from the ninth and loth segments. There is a 

 line of yellow at the extreme apex of some of the terminal segments 

 beyond the spiniferous, apical, transverse carina; the nth segment, 

 ''anal tubercle," of the female yellow except at the sides; appendages 

 black; sides of segments 1-3 mainly yellow ; segments 4-7 with small 

 basal lateral yellow spots in the female; the slightly expanded lateral 

 margins of segments 8 and 9 yellow in both sexes. 



Described from a $ from Saranac Inn taken July 2, 1900, and from a 



5 collected on Mt Tom in Massachusetts ; the larger measurements are 



for the female specimen. 



This Saranac Inn female was the first imago seen there, and it will be 



noted that the date is two weeks after the nymphs had ceased emerging. 



I think this time represents the period necessary for the maturation of 



the eggs after transformation. A similar lapse of time between the period 



of transformation and that of oviposition was observed in the case of a 



number of other gomphines. I believe these insects live longer as 



imagos than is commonly supposed. i\s is well known, they will die 



within a week after transformation if kept in confinement, but apparently 



no one has tried feeding them well while keeping them as yet. May 



they not die of starvation ? 



Nymph. PL 18, fig. 3. Total length 26 mm; abdomen 17 mm; hind 

 femur 5 mm ; width of head 5 mm, of abdomen 6.5 mm. 



Body depressed, abdomen with sides parallel to the eighth segment, 

 then rather abruptly narrowed to an obtuse .point ; lateral spines on seg- 

 ments 6-9, the margins which bear them thin, and on the ninth segment 

 finely spinulose serrate; spines of the ninth segment about as long as the 

 loth segment; very minute rudiments of dorsalhooks on segments 8 and 

 9; before the eighth segment there is an observable trace of the median 

 impressed longitudinal line of the typical Gomphus nymph. The 

 loth segment is about one third the length of the ninth. 



The mentum of the labium is rather short, little longer than broad; the 

 lateral lobe is very moderately arcuate, its apex forming a short end hook 

 not greatly differentiated from the teeth before it; of these teeth on the 

 inner margin of the lateral lobe there are eight or nine, unequal, the mid- 

 dle ones being slighdy largest, angulate, sharp, the fine of their apices 

 being convex internally, rather than concave, as in all the following 

 members of the genus. 



The color, usually obscured by dirt excepting after molting,*is greenish 

 brown, with darker mottlings arranged in transverse bands on abdominal 

 segments, scars on abdomen surrounded with paler color. 



The third antennal segment is linear, a little depressed and widened 

 apically, hairy, as is usual, on the margins. 



