^^c., I9I1.] Banks: Psammocharid.e. 221 



certain as to the first generic name for this group, and used Ponipil- 

 oidcs Rad. Disregarding the number of submarginal cells (and one 

 species of this genus is variable in that character) the name, Aporiis, 

 would be available, and I presume, will be adopted, eventually. Ash- 

 mead's genus SpUopompUiis may be recognized by the vestiture of the 

 basal abdominal segment, it is the same as Episyron. Ashmead's 

 Bataaonus and P(XcilopompUus may together form another genus 

 based on an unused character. Arachnophroctonus Ashmead is 

 closely allied, but may be kept separate on other unused characters. 

 The absence or presence of spines on the under surface of the last 

 joint of the hind tarsi will distinguish the two groups of the old 

 Priocncniis, and the absence or presence of erect hair on the meta- 

 notum will divide the old Agcnia. The shape of the third submarg- 

 inal cell has often been used, and I have used it somewhat in the 

 table, but am aware that it breaks down in other groups, and may not 

 therefore be constant in those I have used. However, other char- 

 acters are used in connection with it. I know of no character to 

 separate the species considered as belonging to Mygnimia from the 

 large species of the old Priocnemis. Mr. Rohwer informs me that 

 the typical Mygnimia is very different from our species so placed, 

 therefore the genus may be valid, but our species belong with the 

 large species of Priocnemis in a group called Priocnemoides by 

 Radoszkowski. There may be an older name for this group. Under 

 Psammochares I have tabulated the groups that can be distinguished 

 by characters in the females; but until the males can also be dis- 

 tinguished I prefer to keep them all under the one name. Our P. 

 virginiensis is very close to the type of Anopliiis. P. illinoiscnsis will 

 also go in this section. Lophopompilns was made for large Psam- 

 mochares with an excised clypeus. I have not seen the genotype, but 

 if not congeneric with our P. ccthiops then Ashmead's Pompilogastra 

 is available. The type of Caliciirgus is extremely close to our Prioc- 

 nemis alienatus, but the character used for the genus is not constant 

 in the two European specimens I have, nor in our species, therefore I 

 do not use the name. The type of Aporus is structurally close to 

 P. marginatus, it is not closely related to the species placed in this 

 country in Aporus, therefore I make a new name for our species. I 

 have not seen the type of Agenia, but some species have the metanotum 

 hairy as in Psendagcnia. Agcnia is preoccupied in the Hemiptera, and 



