680 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Subgenus Ammobia Billberg. 

 Key to Species. 



Abdomen and legs black; wings blackish pennsylvanicum 



Abdomen in part and legs red or reddish; wings subhyaline 



ichneumoneum 



C. (A.) ichneumoneum Linnaeus. Howard, Insect Book, PI. 

 v, Fig. 1 8. 



For an interesting account of the habits of this species see 

 chapter 2 of Peckhams' " The Solitary Wasps." The nests are 

 provisioned with grasshoppers. 



Common throughout the State, appearing in June and remain- 

 ing until October, when it is a conspicuous visitor of the flowers 

 of sumac, Clematis, Asclepias, mint and Cecmothus. Branford, 

 Hartford, New Haven, and Stonington. 



C. (A.) pennsylvanicum Linnaeus. Howard, Insect Book, 

 pi. vii, Fig. 20. 



This species has been taken at New Haven but probably has 

 a much wider distribution. 



SPHECINI. 



The wasps belonging to this tribe used to be, and by some 

 still are, designated by the name Ammophila. Unfortunately it 

 was necessary to sink the generic name Ammophila, and replace it 

 by the Linnasan name Sphex, which had been previously used for 

 the insects treated as Chlorion, subgenus Ammobia, in this report. 

 The nomenclatural change is very unfortunate, but entirely 

 unavoidable. 



Sphex Linnaeus. 



This genus, as far as the forms in the region under considera- 

 tion are concerned, may be divided into two subgenera on char- 

 acters found in the abdomen. The species of North America 

 are being revised by Dr. H. T. Fernald and it is very likely that a 

 number of changes in the names will be made by this writer. In 

 view of this forthcoming revision, the following table is adapted 

 from " Synopsis of the North American Species of Ammophila," 

 by A. L. Melander, with no changes or additional characters. 

 This will probably necessitate fewer changes to accord with 

 Femald's revision. The species of this genus provision their 

 1 :--:! with lepidopterous larvae and are often useful in de- 



