NO. 14X7. 



NORTH AMERICAN DIGGER WASPS— FERNALD. 



295 



The following tables, showing these changes, ma}^ be of assistance in 

 this connection: 



Family. 



Sphecidse 



PRESENT ARRANGEMENT. 

 Subfamilies. Genera. 



Splieoinfe. 



Sphex. 



Su.hr/eriera. 



Chlorion. 



Palmodes. 



Priononyx. 



Sphex. 



Isodontia. 



A.iiinn<>})liilinep. 



Famili/. 



Seoliphroiiinap. 



Ammophila. 



II Psamiiiophila. 



NEW ARRANGEMENT. 



Subfamilies. Genera. 



Sphecidae 



Cln 1 ovion.in.fir' 



Seeliphroiainap. 

 Sphecinae. 



Chlorion. 



)Sphex. 



Ill Psammophila. 



Subgenera. 



Chlorion. 



Palmodes. 



Priononyx. 



Proterosphex 



Isodontia. 



The genitive of Sj>]ii;r being Sj^hecos instead of Sphrg/s it follows 

 that the subfamily and family names should be Sphecina^ and Sphecida^, 

 respectively. 



GENERAL CHARACTERS. 



The insects of the subfamily Chlorionina found in North America 

 and the West Indies, are of moderate or small size, ranging from about 

 half an inch to an inch and a half in length. Generally speaking, they 

 have rather robust bodies, large wings, and long legs. The surface of 

 the body is rarely entirely smooth. Usually the plates of which it is 

 composed bear punctures, varying in size and in their nearness to each 

 other. Closely correlated with the character of these punctures is the 

 clothing of the body, and examination of the surface shows that the 

 punctures are the places of origin of the hairs which form the cloth- 

 ing. The finest punctures are almost or quite microscopic, close 

 together, and the hairs arising from them are exceedingly minute, 

 short, decumbent, and give a sort of silky sheen to the surface. I 

 have used the word "sericeous" to indicate this condition in the 

 descriptive portion of this paper. Somewhat coarser punctures and 

 correspondingly coarser hairs produce such an appearance as is found 

 on the posterior side of the hind tibije throughout this group. Still 

 slightly coar.ser punctures and a clothing which consi-sts of short 

 decumbent hairs placed close together constitutes the next step, and I 

 have used the term '••pubescent"' to express this condition, which occurs 



