lO 



University of Michigan 



Ischnogomphus jessei, new species 



Description : Abdomen, male 32.5 mm. ; hind Aving, male 

 24 mm. 



Male. — Rear of head and mouth parts pale gray, irregular 

 dark areas and mottlings about the foramen and a small spot 

 against the eye about the lower level of the foramen ; face and 

 f rons leaden gray ; the labrum and f rons more bluish with the 

 enclosed parts more greenish, labrum with a black basal 

 triangular spot, the apex of which just fails to meet a broad 

 transverse bar of black across the apex of the labrum, this bar 

 carried narrowly up the sides of the labrum for about half its 

 length; apex of labrum broadly concave; head above, except- 

 ing frons, brown with ill defined pale areas in front of the 

 lateral ocelli; keel behind the lateral ocelli two-lobed, concave 

 in the median line ; occiput posteriorly straight, without a 

 posterior keel or edge, but rounded ofif, with short, scarcely 

 discernible hair; rear of head swollen as described for Cyano- 

 goiiiphiis tumens and C. conchimis; antenna with the third 

 joint very small, scarcely half the length of the second. 



Prothorax brown, obscure, the middle lobe the palest and 

 the hind lobe the darkest, an obscure median pale spot on the 

 latter ; front border very narrowly grayish white. 



Dorsum of thorax and, on either side, the mesepimeron dull 

 blue; posterior to the mesepimeron slightly paler and with a 

 greenish cast; a middorsal black stripe; a broad interrupted 

 black stripe parallel to the median stripe and about midway 

 between the latter stripe and the humeral suture; a narrow 

 antehumeral stripe wider above, and a narrow posthumeral 

 stripe wider below; an extensive ill defined dull area at the 

 first lateral suture, and restricted obscure markings on the 

 metcDimeron ; under parts greenish or bluish white. 



