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MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 
and marking are muck the same in the two species, both beiug 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““; 
of hind femur, 20“™; of hind tibia, 20™“. It differs from G. latens Scudder and G. sloanii Packard 
in the longer legs, and can only be confounded with G. stygius. 
Nickajack Cave (Prof. E. D. Cope). 
Ceuthophilus maoulatus Harris. 
Ceuthophilus maoulatus Harris. 
This is not a genuine cave species, as it is abundant everywhere 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 tibiaa; this, however, is not a constaut 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. maoulatus 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. lapidicolus (Pennsylvania to G-eorgia). 
Psochle.* 
I have only seen a few Psocidm 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., Yol. iii, p. 81). Found August 21, 1879, not tar from the 
mouth. 
Hyperetes tessulattjs Hagen. 
Hyperetes tessulatus Hagen. 
Fully described also in my monograph off 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. PI. XVII, Fig. 4, 4a. 4b. 
Dorypteryx pallida Aaron, Trans. Amer. Ent. Soc., 1883, Vol. xi, p. 37, PI. ix, 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 ,nm 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 kuown till now the fossil genus Empkeria, 
belonging to the Psocina, has a trifid maxilla. 
I am indebted to Prof. H. Hagen for the following account of the cave species of Psocidae. 
