NETJROPTEHA TBIOHOPTERA HYDROPSYCHID^E. 



Base of first apical cell considerably, or very much, farther from the root of the wiu^ than tin- l>ase of 



any other apical fork. 

 Third and fourth apiral r.-lU aim it equally distant from l>.i 



Second apical cell less than one-third as long again aa the third ............... '.'. /' 



SIM ond apiral ri'll half aa lini^' a_;ain at tin' third .............................. .",. It. 



Fourth apical or 11 ri-achin^ nin.'h ni-an-r tli" lia-"- than tin- third .................... 7. D. c 



1. DEKollKoriirs AI'.STKACTUS. 



A single specimen, preserved <>n a side view, so .-is t<> show the upper 

 half of the under surface of tin- riu'ht. front wing, :in<l in addition the upper 

 surface of the whole of tin- left front win^r, overlying tin- hind wing and 

 confusing the nenration. Little be-ides the wings ran lie seen, but the 

 stout cylindrical basal joint of the antenna- appear-, followed 1)\- a 1'cw sim- 

 ilar but much slenderer joints. The front wing is slender, subacuminate 

 at tip, the costal margin falling toward the tip at about the same, angle 

 the apical margin retreats from it, the apex itself rounded off, and rath'-r 

 above the middle line of the wing. The first apical cell is remarkably long, 

 the fork originating at the end of the middle third of the wing, and of the 

 same length as the third apical cell; the second apical cell is onlv a little 

 longer. The wing is apparently clear, with the veins narrowly marked 

 with fuscous and faintlv irrorate with fuscous at their tips. 



Length of body, 9"" u ; of front wing, ll mm ; width of same, 3.3 mm . 



Florissant. One specimen, No. 9377. 



2. DEKOBKOCIH-S ('.K 



This species is represented again by a single specimen, showing a dor- 

 sal view of a vague bod v with outstretched front wings, one of \\hich i> 

 nearly complete and tolerably well preserved, showing a portion at least of 

 the nenration with clearness. The wing is not so acuminate as in the pre- 

 ceding species and the apex is in the middle of the wing. The lirst apical 

 cell though long is shorter than in I >. aliMractns, hut extends farther toward 

 the base than either the third or fourth cell, these last being much shorter 

 than in the preceding species. The discoidal cell is apparently fully as long 

 as the median cellule, but its limits are not dearly marked ; the latter is a- 

 long as the fourth fork and very slender. The win^ appears to 1 ..... 1,-ar with 

 infuscated veins, and the whole costal margin broadly but faintlv infn-cate.l 



Length of wing, 8.5 mi " ; breadth of >ame, J.i; 11 ""; length of median cel- 

 lule, 2 mm . 



Florissant. < )ue .-specimen, No. 11144. 



