52 bulletin: museum of comparative zoology. 



2. Mesonotum and occiput deeply and coarsely punctate, sides of 



head and pleurae longitudinally rugulose; metanotum rngulose; 



areolet broadly sessile above .... P. mortidna; sp. now 



Body at most punctulate, never longitudinally rugose . . .3. 



3. Areolet distinctly petiolate, petiole quite long. P. revelata, sp. nov. 

 Areolet sessile or subsessile above 4. 



4. Marginal cell and stigma long and slender, the extreme height of 



the cell less than three times that of the areolet. P. senilis, sp. nov. 



Marginal cell and stigma broad, the height of the cell considerably 



over five times that of the areolet ... P. rcdirira, sp. nov. 



PlMPLA APPEXDIGERA BrUCS. 



Bull. Amer. mus. nat. hist., 190G, 22, p. 494. 



This species, originally described from a single specimen, is repre- 

 sented in the Scudder collection by no less than twenty examples, and 

 I have also received one from Professor Cockerell and examined 

 another from the same deposits belonging to the British Museum. 



It therefore appears to be the commonest ichneumonid occurring at 

 Florissant and also resembles recent species of Pimpla more closely 

 than any of the other fossil Florissant species. In addition to the 

 original description it may be added that the size of most of the speci- 

 mens is considerably in excess of that given for the type, some of them 

 being over 10 mm. in length. 



I have seen only a single male No. 2137, INI. C. Z., (No. 14,285, S. H. 

 Scudder Coll.). It is very slender and measures 7 mm. The abdomen 

 is banded, and aside from sexual differences it resembles the female 

 very closely. 



The following are the numbers of the specimens representing this 

 species in the material before me: 



Nos. 2137-2155, M. C. Z. (S. H. Scudder Coll.). 198, 2425, 3594, 

 6684, 7263, 8921- (8 13 1-8 186), 8709, 9091, 16,367, 11,458, 11,468, 

 14,285, 12,338, 11,943, 13,776, (8080-8353). Amer. Mus. Nat. Hist., 

 A143. British Museum, I. 7380. 



Pimpla morticixa, sp. nov. 



Female. Length 9-10 mm. Probably entirely black. Head deeply and 

 coarsely punctate; antennae with about 28 joints, short and stout, the basal 

 ones being only twice as long as thick; those near the middle slightly trans- 

 verse, and the apical ones strongly so. Mesonotum coarsely punctate like 

 the head; pleurae longitudinally rugulose or corrugate. Metanotum with a 

 superior median, petiolar, and two lateral areas fully enclosed. Spiracle 



