NO. 1371. NEW DRAGON-FLY NYMPHS- NEEDIIAM. 713 



Lenoth 40. includino- ^ills 12 mm., abdomoii 20 mm., hind femur 

 7 mm..r antenna> !♦ nnn.; width of head 5 mm., of •alKJomcn 4 mm. 



P,()dy elongate, cylindric. Head scarcely wider than the thorax, 

 with large, well-rounded, laterally prominent eyes, low ohtusc hind 

 anoles, Tnd a wide notch between the latter on the hiu.l margin. 

 Antennffi long and very slender beyond the two V)asal segments. Ratio 

 of lenoth of segments in order from the l)ase 1 : 1.5 : 3 : 2.5 : 2 : 1.5 : 1. 

 Labium very long and slender; hinge reaching posteriorly beyond th.- 

 bases of hind legs; mentum narrow, with sides parallel, suddenly 

 widened in its distal fourth; median lobe produced, rounded-ahnost 

 truncate— in front, with a shallow, hardly closed median cleft; mental 

 settv 7 each side, decreasing in length internally; lateral sette X.-l. of 

 wlikh but one is on the body of the median lobe, the others bcmg 

 upon the lono-, strong arcuate movable hook; lateral lobe (Plate XLIIl, 

 tio- 7) trifid at its distal end, the divisions each forming snnple arc-uate 

 hooks of which the innermost— the end hook-is longest and strongest. 

 Thorax stout, short. Legs long, slender, smooth. Wing cases 

 almost reaching the apex of the fourth a])dominal segment. 



\bdomen cvlindric, very slightly tapering on the last two segments 

 with stout lateral spines on segments 5-9, lesser ones on segments ;> a.jd 

 4 and with serrulate lateral margins for the entire length Segment 10 

 somewhat compressed, with a sharply compressed dorsal ridge which 

 ends in a high triangular fold whose posterior margins are strongly 

 spinose. Gills broad, oblong, with parallel sides, ol)tuse apices, and 

 distinctly segmented axes; color brown, with transve;.se median and 

 basal (this one interrupted on the axis) pale bands. The better pie- 

 served specimens show the color to have been pale yellowish or green- 

 ish brown, with a transverse row of arcuate marks on the rear ot the 

 liead, indistinct vertical bands on the sides of the thorax narrow Ion 

 o-itudinal lines on the femora, a double row ot brownish clouds eac-li 

 tide of the abdomen, and two little transverse marks on the dorsum 



of 3-T 



This species was bred for me by my friend and former pupil. Mr. 

 Frank C Willard, in the Huachuca Mountains, near lombstone. Aii- 

 !;r^n J^y, 189T. It was found at an altitude of ^^^^'^ 

 feet The following interesting observations as to it> haunt> and 

 habits are quoted f.rom one of Mr. ^Villard's letters: 



The water wa. a swift little n^ountain .trea,n ^^^^^:::^T:ZZ 



keeping their ^^ings horizontal, instead ot hoUhng then. up. a. 



