NO. 1371. NEW BRAGON-FLY'NYMPHH—NEEDHAM. 691 



(Plato XLIII, tig. 2) moderate, reaching posteriorly between the lases 

 of the fore legs; mentiim one-third longer than l)road. slightly widest 

 in the middle and tapering both ways to the ends; median lohe narrow, 

 convex, with a dense fringe of long scale-like hairs; lateral lobe short 

 WMth stont mova))le hook, arcuate end hook, and about seven (juad- 

 rangular teeth on the inner margin, largest in the middle, single 

 microscopic seta? arising from the notches between the teeth. Rear 

 of head with a transverse line of scars. 



Dorsum of prothorax with two confluent scars. Burrowing hooks 

 moderate: legs scantily hairy. Wing cases reach the base of the fourth 

 abdominal segment. 



Al)domen lanceolate, slightly depressed, with multiple scars on seg- 

 ments 3-9; lateral spines on segments 7-9, increasing in length poste- 

 riorly, those of segment 9 one-third as long as the tenth segment. 

 Dorsal hooks wanting; there is a trace of an impressed median line on 

 segments 4-6, and of a scurfy ridge on seguKMits 7-9. Appendages as 

 long as the tenth seg-ment, and about equal each to each. 



GOMPHUS CONFRATERNUS Selys? 



"'Crooked River, Oregon. 21st September, 1871S, No. ."iiUb, Hen- 

 shaAv. " 



Length, 28 mm.; abdomen. 17 mm.; liind femui-. (i.A mm.: width of 

 head, 5.5 mm.; of abdomen, T.5 mm. 



Body lanceolate, depressed, hairy on edge of clypeus. sides of 

 antenna?, sides of the head below the eyes, tibiw externally, and lateral 

 margins of the abdomen. Skin scurfy pubescent. Second segment 

 of antennae half as long as the basal segment, the third segment live 

 times as long as both l)asal together, the fourth segment a mituite 

 rudiment. Mentum of labium (Plate XLIII, tig. H) with parallel sides; 

 median lobe ver}' slightly rounded, densely fringed with hair-like 

 scales; lateral lobes short, arcuate, with long mova])le hook, and 

 short moderately incurved end hook six to nine quadrate teeth on the 

 inner margin, diminishing in size toward the base. 



Burrowing hooks of fore and middk* tibia' strong. ^^'iIlg cases 

 reaching nearl}' the apex of the fourth abdominal segment. 



Abdomen lanceolate, widest across the middle, regularly tapciing 

 to the rather acutely pointed apex, with low. flat trianguJai- pointed 

 rudiments of dorsal hooks on segments 4-9, better develoi)ed posteri- 

 orly. Lateral spines on segments 6-9, increasing in length posteriorly, 

 those on the ninth segment reaching the middle of the tenth segment. 

 Appendages longer than the tenth segment, the laterals slightly 

 shorter than the others. 



I think the supposition as to name a very safe one, since the nymph 

 clearly stands in about the same relation to that of ir. (jnisI!nJh(.'< 

 as the imago holds towai-d the imago of that species: this is i)erhaps 

 the commonest GompJuis of the Xorthw»\st coast States. 



