282 H. A. HAGEN. 



Body elongate, moderately flat, very little hairy, except on legs, this extraor- 

 dinary nynipha combines head and antennse of Hagenius with legs and abdomen 

 of Gomphus; head flat, a little broader than long, between antennse an oblong 

 projection with a round notch on tip and sharp angles, inserted in which a cordate 

 tubercle; eyes similar to H. brevistylus, more rounded, side part of head before 

 front angles of eyes straight, not produced ; ocelli visible ; occiput similar, no tu- 

 bercles, hind angles conical, not elevated; antennae similar, but third joint broad- 

 est a little before middle, the apical half of the external margin more straight; 

 mask similar to IT. nanus f but the produced lobe less rounded, comb longer; the 

 four teeth similar; palpus similar to H. nanus?, but instead of finely dentate, 

 with six strong arcuate teeth, the last one on tip; prothorax as hy H. nanus ? ^ 

 wing cases reaching 4th segment, with several black dots ; abdomen a little ele- 

 vated above, once longer than broad, a little narrower at base, enlarged to 6th 

 segment, the following tapering; segments of equal length, 10th very short, about 

 one-third of 9th, inserted nearly entirely in a deep rounded notch of 9th; lateral 

 spines on 8th and 9th segments sharp, the last one a little shorter than segment 

 10 ; no dorsal hooks; lateral margin of last segments bent up a little, finely ser- 

 rated; anal appendages of H. nanus?: venter slightly rounded, the two sutures 

 as by Hagenius, a little less divergent on 9th segment; middle space a little larger 

 than the lateral ones; legs short, fit for burrowing, very hairy; fore- and middle 

 legs equally distant, femurs thick, bent; tibise with a strong external apical hook; 

 hind legs wider separated, short, scarcely reaching 6th segment, flat, tibise shorter 

 than femur, tarsus as long as tibia, third joint as long as two basal, claws long, 

 sharp, bent at tip; abdomen above with ill defined brown markings; each side of 

 the median line three black basal dots on most segments. 



This remarkable nympha has the head and antennae of Hagenius, the 

 ventral sutures and mask, except palpus, of the supposed Hngenins 

 nanus, the distance of middle legs, the abdomen, except last segment of 

 Gromphus. The species to which the nymphae, which are collected in 

 winter, and therefore young (perhaps very young), belong is not known. 

 It is, of course, possible that the imago is not yet known, but this is 

 somewhat improbable, as just in this part of Kentucky many excellent 

 collectors have been collecting. Perhaps it may be the nympha of 

 TJropetala Thoreyi, which is there by no means rare. At least I know 

 no other species to which it can be supposed to belong. 



Ill Legio LINDENIA. 

 Genus Ictinus (supposition). 

 Selys Monogr. Gomphin. p. 263. 

 The nymphae of Ictinus though similar to Hagenius by the large 

 rounded abdomen and hind legs longer than the abdomen, differ by im- 

 portant characters from Hagenius and all other groups. 



The hind legs have only two jointed tarsi, whereas all other Gom- 

 phina have three joints. The longitudinal ventral sutures are straight, 

 but divergent on the 2d and 9th segments as in Hagenius. Besides 



