June 1S90.] 



PSYCHE. 



353 



considerably thicker. The markings 

 of the body have materially changed. 

 The prothoracic shield, in the two 

 last stages split in two longitudinally, is 

 now also split tranversely, so that it is 

 represented by four transversely narrow 

 piliferous warts. On each succeeding 

 segment there is a transverse dorsal 

 broad black-brown band, which en- 

 closes a yellowish white narrow stripe, 

 which in the middle and at each end 

 enlarges into a round spot ; there are 

 ten such curious whitish stripes on a 

 blackish ground, which only extend 

 part way down the sides of the body 

 toward the spiracles. The piliferous 

 warts are not so pronounced as in the 

 preceding stages, while the body and 

 hairs are of a pale chestnut hue. 



Stage VI atid last. — Length 

 23-24 mm. (Evidently underfed, Mr. 

 Edwards's specimens measuring 52 

 mm.). In the final stage the head 

 is pale chestnut, with no black por- 

 tion. The top of the body is now 



black, and each segment except 

 the first behind the head bears two 

 transverse white stripes, one in front 

 and the other behind a transverse 

 chestnut-red band, enclosing the pilifer- 

 ous warts, which are much more promi- 

 nent than in the 5th stage. Of the two 

 yellowish white transverse stripes, the 

 one on the front of the segment is divided 

 into a central dot with a separate slash 

 on each side ; the hinder band consists 

 of three portions, a central dot, from 

 which a stripe passes each side, and in- 

 stead of ending in a dot, makes a loop 

 or hook. Our drawings made by Mr. 

 Bridgham agree w^ell witli Mr. Ed- 

 wards's description. 



It thus appears that the markings 

 of the two last stages of this larva are 

 very different from those of any genus 

 whose larval history is known to us ; 

 Mr. Edwards has pointed out its rela- 

 tions to the larva of Arachnis and 

 Ecpantheria, with which we are not 

 familiar. 



0- 



TWO SPECIES OF AESCHNA. 



BY HERMANN AUGUST HAGEN, CAMBRIDGE, MASS. 



I. Aeschna SITCHENSIS. 



Aeschna sitchensis Hagen, Syn. 

 Neur. N. A. 1 19, i. 



Blackish-brown, spotted with blue ; 

 head yellow in front, anteriorly with a 

 narrow transverse black line ; superiorly 

 a large black spot in the shape of a t, 

 nearly or entirely connected each side 



with a black band before the eyes, form- 

 ing two yellow spots surrounded with 

 black on the superior part of the front ; 

 rhinarium and border of the labrum 

 black ; eyes largely connected ; occiput 

 yellow, hind border elevated, black on 

 each side ; thorax fuscous, dorsum with 

 two median elongated points ; sides 



