J. CHESTER BRADLEY. 131 



gj'ooves on it are as follows : a regularh' curved groove on each side 

 extending from the posterior to the anterior margins, spoken of as 

 the parapsidal groove: a short longitudinal groove on each side 

 between these and the tegulfe, called the lateral grooves : and two 

 very short grooves in the middle extending backwards from the 

 anterior margin, called the anterior grooves. These are all present 

 in E. appendiyaster, and form good characters for separating species. 

 The mesopleurse (Fig. 18) are oblique rhomboidal sclerites, partially 

 separated from the mesoventer only by an obscure groove. An 

 oblique sulcus traverses it in which the femora of the middle legs 

 may be fitted, when drawn up, and which together with the poste- 

 rior part is highly polished in Hyptia. Anterior to this sulcus the 

 sclerite is rounded out and full, forming what I have called the 

 anterior swelling. The entire venter is usually more finely punc- 

 tured than the other sclerites. The middle coxse occasionally are 

 placed far posteriorly, thus prolonging the mesoventer; the latter is 

 mesally divided by a longitudinal suture, and ends between the coxse 

 in a l)ifurcate process or furcula. The middle coxae are placed 

 wider apart tlian tlie posterior, but the ratio of the two distances 

 varies in ditterent species. The metaventer is similar, but undivided 

 from tlie metapleurte, and without a medial sinus. The posterior 

 coxae are more or less closely placed, and the furcula in which the 

 metaventer ends is of primary specific importance; the lobes or 

 tynes may be mere knobs (as generally in Hi/ptia'), or may be elon- 

 gate, parallel (Fig. 64) or divergent (Fig. 6H) processes. The 

 metapleura (Fig. 18) is roughly triangular, with its apex beneath 

 the posterior wings; it is often not separated posteriorly from the 

 propodeum. The scutellum is a large nearly quadrate piece. 

 Directly behind it and sunk in a deep depression, forming scarcely 

 more than a transverse line, is a sclerite tiiat I have called the 

 metanotuni, although it may be the postscutellum (Figs. 62 and 63). 

 If looked at from the side tliis sclei'ite seems to form the bottom of 

 a narrow groove, which, in Evaniime, has very steep walls, in Hyp- 

 tiini these walls are more sloping, a difierence illustrated by Figs. 

 62 and 63. 



The distance from the nietanotum to the insertion of the petiole 

 varies, but is approximately and on the average a little less than 

 the length of the petiole, and about the lenglli of the scutellum ; 

 behind this the propodeum is produced a short distance and then 



TRANS. AM. KNT. SOC. XXXIV. APRIL. 1908. 



