HEMIPTERA— HETEROPTEEA— GALGULID^. 



347 



Length of body, 4.2"" ; breadth, 1.85""" ; length of hind legs, 5.35""°. 

 The species is named for the Massachusetts geologist, Prof B. K. 

 Emerson, of Amherst. 



Florissant. Two specimens, Nos. 3857, 10729. 



Family GALGULID^E Westwood. 



The only fossil hitherto known as belonging to this family is an insect 

 from the brown coal of Rott, described by Heyden as a mite under the 

 name Limnochares antiquus, but shown by Bertkau to be a galgulid, and 

 probably only a larval skin of one at that. Bertkau also regards the Flor- 

 issant fossil, described above as a Thysanuran under the generic name 

 Planocephalus, as a very similar creature and probably a larval galgulid, 

 but in this I can not follow him ; nor are any other Galgulidte known among 

 the mass of insects found at Florissant. In the similar beds at Green River, 

 however, a single insect is preserved (all but the abdomen) which seems to 

 present characters which show it to be the nearest related to Pelogonus, 

 which, however, I know only from description and the figure of Dufour 

 The present species is very remarkable for several points : the form of the 

 head, the absence of any sign of eyes on the upper surface of the same 

 (darker patches at the outer limits of the head probably indicate their exist- 

 ence at this point beneath), the flattened body, and the long, rod-like legs, 

 the front pair longer and larger than the others, but quite similar in char- 

 acter (except for lacking a tarsal joint) and in no way raptorial. It shows 

 certain resemblances to Aphelocheirus, but on the whole seems rather a 

 member of this family than of the Naucoridse. 



NECYGONUS gen. nov. {vdnv?, yovrj). 



Body broad oval, apparently much flattened. Head subsemicircular, 

 more than twice as broad as long, the front border strongly and uniformly 

 rounded, hind border truncate, nearly as broad as the thorax, the eyes ap- 

 parently wholly inferior, situated at the posterior outer angles. Rostrum 

 long, lancet-shaped, not very sharply pointed, the last joint about a fourth 

 of the total length. Antennas long and slender, considerably longer than 

 the width of the body, the last joint nearly as long as the tarsi. "AH the 

 legs long, slender, rod-like, similar, the femora nowhere swollen but twice 



