SCUDDER ON FOSSIL INSECTS, 749 



CHALCIDID^. 



Deeatoma antiqua. — On the same stone (No. 4076) as Lystra Richard- 

 soni, but at a slightly higher level, is a minute Chalcid fly. The wings 

 are wanting, but the whole of the body is preserved, together with the 

 antennse. The head is large, arched, and otherwise well rounded, the 

 face tapering below, the eyes large, deep, with their inner borders nearly 

 parallel, leaving an equal front ; the base of the antennse cannot be 

 made out, but beyond the long basal joint are six nearly equal quadrate 

 joints, increasing very slightly indeed in size away from the head, 

 scarcely so long as broad, the apical joint subconical, scarcely longer 

 than the penultimate. Thorax compact, globose, minutely granulated, 

 like the head; the abdomen also compact, arched, the tip rounded; 

 beyond it, the ovipositor extends very slightly, apparently by pressure. 



On a stone collected by Mr. Eichardson (No. 86) is pretty certainly 

 another specimen of this species, in which the abdomen is distorted by 

 pressure; the abdomen shows this by the rupture of the integument, 

 and the result is an apparently slenderer abdomen ; it is also a female, 

 with exactly the same parts preserved, with the addition of the other 

 antenna; but both antennse are more obscure than in the other specimen, 

 especially at the apex; they appear, however, to enlarge more rapidly, and 

 may be clavate at the tip, in which case the insect cannot be the same. 



Length of body (of No. 4076) 1.85"™, of abdomen 0.95"™, of antennae 

 beyond basal joint 0.4"""; width of penultimate antennal joint 0.015™". 



DIPTERA. 



CHIEONOMID^. 



CJdrononius sp. — A minute specimen (No, 141), apparently of this 

 family, was taken by Mr. Eichardson. Unfortunately, it has no wings, 

 and little can be said of it, more than to record its occurrence; it is 3"™ 

 long, has large eyes, a stout thorax, and altogether resembles a Ghirono- 

 mus; it is, however, distinct from any found by Mr. Denton in the White 

 Eiver shales. 



TIPULID^. 



Dicranomyia primitiva Scudd. — A single wingless male (No. IG), taken 

 by Mr. Eichardson, can be referred doubtfully to this species, originally 

 described from White Eiver. 



About fifteen other specimens of Tipulidw were collected by Mr. 

 Eichardson, Mr. Bowditch, and myself at the same spot, but, unfor- 

 tunately, not one of them presents the vestige of a wing, and seldom 

 anything more than the body ; probably some of them also belong to the 

 above-named species; others may with more doubt be referred to D. 

 stigmosa Bcadd.; but all are valueless for any precise determination, 

 and, indeed, may not belong to Bicranomyia at all. 



