6 U. S. NATIONAL MUSEUM BULLETIN 216 



Tarsal claws of female, or at least the front claws of female, with a basal tooth 

 except in Perithous and in the European genus Eremochila (figs. 285,a- 

 297, b) ; tergites 2 through 4 usually with rather coarse, distinct punctures; 

 areolet present or absent; male subgenital plate usually wider than long . . 6 

 6. Last segment of tarsus not enlarged, a little narrower than the basal segment 

 of the tarsus (figs. 285,a-292,a) ; areolet present except in Zaghjptus, Clis- 

 topyga, and some Tromatobia and Acropimpla; ovipositor of approximately 

 uniform size between its middle and its apical point (figs. 285,a-292,a), 

 except in Clistopyga (fig. 291, a) 1. Pimplini (p. 6) 



Last segment of tarsus enlarged, a little wider than the basal segment of the 

 tarsus (figs. 292,b-297,b) ; areolet absent except in Laufeia; ovipositor tapered 

 from near middle to its apical point (figs. 292,b-297,b). 



2. Polysphinctini (p. 216) 



1. Tribe Pimplini 



Figures 285-292,a 



Front wing 2.5 to 22 mm. long; clypeus usually a little convex 

 basally and a little impressed or concave apically, with a median 

 notch in its apical margin which gives it a bilobed apex, sometimes 

 the clypeus more uniformly convex, truncate apically, or with a 

 median apical tubercle; mesoscutum without transverse wrinkles, its 

 notauli moderately strong, weak, or vestigial; prepectal carina present 

 except in Alophosternum, in Dolichomitus cuspidatus, and in an un- 

 named Neotropic genus; mesopleural suture with an angulation just 

 above the middle ; propodeum usually with its pleural carina complete, 

 sometimes with apical part of lateral longitudinal carina preserved, 

 and often with basal 0.4 ± of median longitudinal carinae present, 

 otherwise without carinae except that in Perithous the petiolar area 

 may appear to be completely bounded by a carina; last segment of 

 tarsus not enlarged, a little narrower than basitarsal segment; tarsal 

 claws of male simple; tarsal claws of female with a large, basal, 

 lobelike tooth (except in Perithous, on the hind claws of a Japanese 

 species of Alophosternum, on the middle and hind claws of an un- 

 named Oriental genus, and in the European Eremochila ruficollis); 

 tarsal claws without an enlarged hair with a flattened tip; areolet 

 present except in Zaglyptus, Clistopyga, and in some species of 

 Tromatobia and Acropimpla; nervellus broken above, near, or below 

 the middle, or sometimes not broken ; first tergite free from its sternite 

 except in an unnamed genus from the Orient, its lateral carina usually 

 strong; subgenital plate of male transverse, its apex usually truncate 

 or retuse, but in Perithous longer than wide and tapered to a blunt 

 point ; last tergite of female without an apical horn or boss ; ovipositor 

 usually moderately long to very long, rather slender, and of uniform 

 diameter, but in Clistopyga short, upcurved, and tapered. 



The Pimplini are parasitic on hosts hidden within plant tissues or 

 cocoons. Their long ovipositors are used in reaching such hosts. 



