OF WASHINGTON. 
97 
HETEROGYNA. 
TUBULIFERA. 
I Mjrmicidae 
j Odontomachidrc 
| Poneridre 
[ Formicidae 
Chrysididae 
It will be seen that the anomalous family, Pclecitiidie, is assigned a po- 
sition between the Pompilidce and the Sp/icctdce. 
Mr. Cresson placed it temporarily near Ichiisuntonidoe, but it cannot be- 
long there, the trochanters being one-jointed, a fact to which Mr. Cresson 
calls special attention It seems to me to be allied to the long-bodied 
Sphecids, Ammophilce, and a position is assigned the family near them. 
Prof. Packard has, somewhere, called attention to the fact that the male 
Pclecinus resembles the genus Trypoxylon in the family Crabronidae. That 
this anomalous family belongs somewhere in this section, I think cannot 
be questioned. 
The families Mulillidce and Chtysididce lead naturally into the Hymen, 
ditrocha, through closely allied forms in the family Proctotrupidce, and for 
Avhich reason that family is placed at the head of that section 
For the section Hymen, ditrocha the divisions first proposed by St. Far- 
geau are preferred to those made use of by Mr. Cresson, for they enable 
the presentation of a much more natural sequence of the families than 
could otherwise be given. 
They are as follows : 
HYMEN. DITROCHA. 
Ovipositor consisting of a single horny piece issuing from the tip of the 
abdomen, CANALIFERA. 
Ovipositor spiral or semi-spiral, retractile when at rest, . . SPIRIFERA. 
Ovipositor of two horny, saw-like pieces, SERRIFERA. 
Ovipositor partly lodged at rest in an external sheath from beneath some 
distance from apex of abdomen, ...... TEREBELLIFERA. 
According to these divisions the families in this section would be ar- 
ranged as follows : 
f Proctotrupidae Proctotrupinae 
Sceleoninae 
Platygasterinae 
Belytinae 
Diapriinae 
Proctotrupidae 
Helorinae 
Dryininze 
Emboleminse 
Bethylinse 
Ceraphroninae 
Cynipidae 
SEC. i : Cryptogastri 
Eucoilinas 
Figitinse 
Allotriinae 
SEC. 2 
Oryssidse 
Gymnogastri 
Inquilinae 
Cynipina.' 
Ibaliinae 
