72 MEMOIES OF THE NATIONAL ACADEMY OF S CIENCES. 



and marking are much the same in the two species, both being thickly spotted with black-brown; 

 G. ensifer has darker colors and more distinct spots than G. stygius, though the latter grows to a 

 larger size. Length of whole body, not including the ovipositor, 22 mm ; length of ovipositor, 8 mm ; 

 of hind femur, 20 mm ; of hind tibia, 20 mm . It differs from G. latens Scudder and C. sloanii Packard 

 in the longer legs, and can only be confounded with G. stygius. 

 Nickajack Cave (Prof. E. D. Cope). 



Ceuthophilus maculatus Harris. 



Ceuihophilus maculatus Harris. 



This is not a genuine cave species, as it is abundant every w here out of doors under stones and 

 leaves. I have never seen it in any cave. 



A specimen from the Hoosac Tunnel, Massachusetts, collected by Professor Shaler at a point 

 1,500 feet from the entrance, only differs from ordinary examples in the want of the usual twist in 

 the hind tibia; this, however, is not a constant character. 



A specimen was found March 15, 1870, by Mr. R. P. Whitfield (and loaned me by Mr. J. H. 

 Emerton) in Howe's Cave, New York, at a point half a mile in from the mouth. It is not different 

 from other specimens found under stones, being no paler in hue. 



It should be observed that G. maculatus is a boreal species, not having, so far as we are aware, 

 been found south of the New England States; it is probably replaced in the Middle aud Central 

 States by G. lapidieolus (Pennsylvania to Georgia). 



Psocidjb.* 



I have only seen a few Psocidee from caves, and such only from the Mammoth Cave. They 

 represent two or three species. 



Atropos divinatoria Muell. 



Only one specimen mentioned in my monograph Atropina, Stett. Zeit., 1883, volume xliv., page 

 291. There is given a very detailed description of this species and figures, PI. ii. Mr. Hubbard 

 found the specimen upon offal from the Rotunda Cave, after it had been taken to Detroit. Though 

 its occurrence is very probable in the cave (as its occurs everywhere), he considers, very judiciously, 

 the specimen not as certain (Amer. Ent., Vol. iii, p. 84). Found August 21, 1879, not far from the 

 mouth. 



Hyperetes tessulattts Hagen. 



Hyperetes tessulatus Hagen. 



Fully described also in my monograph of Atropina, page 319, PI. ii, fig. 2. I have stated that I 

 have seen one specimen, partly crushed, collected on manure of bats in the Mammoth Cave. I do 

 not find this specimen in the collection, and I do not remember by whom it was collected ; but 

 one of the two specimens of Hubbard is crushed, and shows the tip of the maxilla trifid, as in 

 Hyperetes. Perhaps this has induced me to consider the specimen as Hyperetes, and it would 

 need confirmation by other specimens. I think it belongs to the following species. 



Dorypteryx pallida Aaron. PL XVII, Fig. 4, 4a. 4&. 

 Dorypteryx pallida Aaron, Trans. Atner. Ent. Soc, 1883, Vol. xi, p. 37, PI. is, fig. 3. 



A few specimens in bad condition, in alcohol, were collected by Prof. A. S. Packard in the old 

 mouth of Madison's Cave, in partial daylight. They are different in size, the largest a little more 

 than 2 mm long, the smallest l mm . The fact that the tarsi are three-jointed induced me to say that 

 they may perhaps belong to Elipsocus or Myopsocus, the only genera known with three-jointed 

 tarsi and wings in the United States. My later studies showed the tip of the maxilla to be 

 trifid, and so the affinities mentioned before can not be accepted. The Psocina have a bifid 

 maxilla, the Atropina a trifid one. Only as far as known till now the fossil genus Empheria, 

 belonging to the Psocina, has a trifid maxilla. 



* I am indebted to Prof. H. Hagen for the following account of the cave species of Psocidse. 



