102 A. S. Packard, Jr., on Insects inhabithig Salt ^ 



From just above the base of the 1 

 tion of the wings arises a pair of n 

 which are broad and 



spines, probably locomotive, 

 lead, and in front of the inser- 

 »f meso-thoracic respiratory tubes, 

 their base, suddenly becoming 

 cylindrical and slender a little beyond their middle, and pro- 

 jecting slightly beyond the head. The mesothorax is tei^ally 

 full and roimded. The abdominal segments are very convex, 

 with the sutures deeply marked, the edges of the segments 

 bemg bevelled in toward the suture. The hinder edge of each 

 nng IS raised into an acute ridge, armed with a few short hairs. 

 The terminal segment is slender, no wider than long, and with 

 a small acute, terminal spine on each side. No respiratory 

 appendages. It is whitish, with a yellowish tinge, and is -15 of 

 an inch in length. No adult Tanapus occurred in the collection, 

 Siratiomys, sp. (Fig. 8 a, top view ; h, side view).— With the 

 young of Tanypus were associated several larvj© of this genua 

 They are long and slender, the body tapering alike toward 

 3. both ends. The head is chitinous, sub-conical, 



and nearly as long as the prothoracic segment 

 On each side of the base of the head is a deep, 

 slightly curved sinus (closed anteriorly in older 

 specimens), thus forming a rather long tongue- 

 like lobe to the under side of the head. Above, 

 the head is divided by two deeply impressed 

 lines into three lobes extending nearly to the 

 posterior third of the head ; these lobes are 

 acutely pointed, the middle one being the long- 

 est, and embracing tlie clypeo-labral region. 

 On the side of the outer lobes and at the middle 

 of their length aj-e situated the two ocelli. The 

 antennae are minute, acute tubercles situated at 

 the ends of the outer lobes. The maxilli»('0 

 are two 2-jointed palpus-like appendages, with 

 long hairs at the extremity, and play with much 

 freedom up and down on' the under side of the 

 head, between the inner and outer lobes. Man- 

 dibles not distinguishable, llie mouth pai| 

 mu 1- 1 '^^® ^^^ inserted beyond the middle of the head. 



ihe body is rather flattened and broadest just in front of the 

 middle ; the segments are quite convex, with the sutures well 

 marked. A pair of well marked stigmata on the prothoracic 

 nng; none behind. The body is horn colored, paler beneath. 

 with the integument densely punctured; the upper surface oi 

 the body is marbled with alternate light and dark streaks, m 

 the middle of the body fading out in the middle of each seg- 

 ment, but toward the end of the body disappearing toward 

 the sutures. On the side of each segment are four rows ol 

 minute dark dots, the upper row passing over the back at nearly 



