621 



is very long, filiform and multiarticulate. In Hydropsyche the 

 spurs are arranged thus : '2, 4, 4. The antenna' are rather 

 long and slender, the ocelli are absent, and the intermediate 

 feet of the female are dilated. H. scalar i^ Hageu is 1 thick 

 gray, with white hairs, and the antenme are yellowish, and 

 obliquely striated with black at the base ; the first joint is 

 covered with snow-white hairs. Philopotamus has three ocelli, 

 and the tibial spurs are arranged thus : 2, 4, 4. 



In Rhyacopliila the maxillary palpi have the last joint entire, 

 straight, shorter than the rest ; while there are three ocelli, and 

 the tibial spurs are arranged thus : 3,4, 4. R. fuwiilu Walker 

 is rust-red, with some black hairs and a subfuscous spot on 

 each side of the thorax. It comes from Hudson's Bav. 



Another curious Neuropterous insect found in the iron-stone 

 concretions of Morris, 111., is the Megathentomum pustulatum 

 of Scudder (Fig. 617, natural size), described and figured by 

 him in the "Palaeon- 

 tology of the Illinois 

 State Geological Sur- 

 vey." "The fragment 

 represents a wing (ap- 

 parently an upper one) 

 of a Neuropterous iir 

 sect. It is gigantic in 

 size, very broad, with 

 distant nervures, sim- 

 ple infrequent divarica- 

 tions, and in the outer 

 half of the wing, which 

 alone is presented, a 

 cross neuration, composed solely of most delicate and irregu- 

 lar veinlets. The wing is also furnished with a great number 

 of larger and smaller discolored spots, the surfaces of the 

 larger ones irregularly elevated." Mr. Scudder thinks the 

 wing is allied to that of Coniopteryx, adding ' ' it appears to 

 belong to a family hitherto nndescribed. I do not know of a 

 single insect, living or fossil, which approaches it in the struc- 



Fiff. (',17. 



ture of the wings. 



