748 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



geuiis, but is in rather a poor state of preservation. The head is small 

 and rounded, with antennae shaped as in Lasius, but of which the num- 

 ber and relative length of the joints cannot be determined, from their 

 obscurity ; the long basal joint, however, appears to be comparatively 

 short and uniform in size, being not quite so long as the width of the 

 head, while the rest of the antennae is more than half as long as the basal 

 joint, and thickens very slightly toward the apex. The thorax, pre- 

 served so as to show more of a dorsal than a lateral view, is compact, 

 oval, less than twice as long as broad, with no deep separation visible 

 between the meso- and metathorax, tapering a little posteriorly. The 

 peduncle, as preserved, is a minute, circular joint, but from its discolo- 

 ration appears to have had a regular, rounded, posterior eminence. The 

 abdomen consists of live joints, is very short-oval, very compact and 

 regular, and of about the size of the thorax, although rounder. The 

 legs are long and slender, the femora of equal size throughout, and all 

 the pairs similar. There is no sign of wings, and the specimen is prob- 

 ably a neuter. 



Length of body T.S*""^, of head 1.4™°>, of thorax 3.2 ™", of abdomen 

 2.9'^°^; breadth of head l.!™-", of thorax 1.9"™, of abdomen 2.2"""; diam- 

 eter of peduncle 0.55"""; length of first joint of antennae 1""", of rest of 

 . antennae 1.65"'" (?). 



MYEMIOID^. 



Myrmica sp. — A species of this family was found by Mr. Eichardson 

 (j!^o. 53), but a specific name is withheld in the hope of finding better 

 material on which to base it. The head is rather small, circular ; the 

 thorax very regularly ovate and nearly twice as long as broad; the 

 peduncle small, and composed of two adjoining circular masses, the 

 hinder slightly the larger ; the abdomen is much broken, but evidently 

 larger than the thorax and pretty plump ; no appendages are preserved. 



Length of body 3.3"™; diameter of head 0.4""; length of thorax 1.2""; 

 width of same 0.75""; length of peduncle 0.25""; diameter of anterior 

 joint of same 0.1""; width of abdomen 0.85"", its probable length 1.8"". 



BEACOOTD^. 



Bracon laminarum. — A single specimen and its reverse (Nos. 4196,4197) 

 show a body without wings or other appendages. The head is quad- 

 rate, broader than long, and nearly as broad as the thorax. The thorax 

 is subquadrate, either extremity rounded, about half as long again as 

 broad, the sides nearly parallel, and the surface, like that of the head, 

 minutely granulated ; abdomen fusiform, very regular, in the middle 

 as broad as the thorax, as long as the head and thorax together, taper- 

 ing apically to a point, and composed apparently of six segments. 



Length of body 2,8"", of head 0.6"", of thorax 0.85"", of abdomen 

 1.35""; breadth of head 1.1"" , of thorax 1.2. 



