ICHNEUMON-FLIES — GELINAE : MESOSTENINI 307 



1.5 to 2.0 as long from spiracle to apex as it is wide; second tergite 

 polished, its punctures fine, weak, rather dense; tergite 7 not marked 

 with white; ovipositor sheath about 0.60 as long as front wing; 

 ovipositor slender, cylindric, weakly upcurved, its tip long and 

 slender. 



Joppidium is a relatively small genus, ranging from central United 

 States to central Argentina. Mexico has the largest number of 

 species. Adults occiu" characteristically in open weedy places, 

 flying in strong sunlight. They are rather frequently taken on 

 flowers and at honey dew. None of the species has been reared. 



The genus may be divided into three species groups. Two of the 

 groups occur within our limits. A description of the third is included 

 to make a more complete treatment of the subdivisions of the genus. 

 The exotic species are listed under their species groups. Joppidium 

 annulicorne Ashmead 1895, described from Baja California, Mexico, is 

 not a Joppidium. It belongs in the Ichneumoninae. 



Key to the species groups and to the Nearctic species of Joppidiuiu 



1. Upper tooth of mandible about half as long as lower tooth; first tergite of 



female with a weak dorsolateral longitudinal carina; apical carina of pro- 



podeum distinct, interrupted medially. Brochum group (p. 307) .... 2 



Upper tooth of mandible about equal in length to lower tooth; first tergite 



of female without a dorsolateral longitudinal carina 3 



2. Propodum black or brown; hind tibia yellow . ... 1. brochum, new species 

 Propodeum ferruginous; liind tibia fulvoferruginous to brownish ferruginous. 



2. fuscipenne (Brull6) 



3. Mesopleurum and propodeum with more or less distinct wrinkles, medium 



sized or coarse punctures, or both; apical carina of propodeum absent or 

 indistinct; lower half of frons with a median pair of carinae or group of 

 wrinkles that are ventrally vertical and parallel, more dorsally curved 

 outward above each antennal socket. Rubriceps group (p. 311) . ... 4 

 Mesopleurum and propodeum without wrinkles or coarse punctures; apical 

 propodeal carina represented by two transverse tubercles; lower half of 

 frons smooth, without wrinkles or carinae. Moerens group, (p. 318) 



(Not Nearctic) 



4. Body ferruginous 5 



Body black, blackish, or largely blackish 6 



5. Hind tibia yellowish, fulvous on base and apex; mesopleurum of male mostly 



smooth; metapleurum of female largely wrinkled but its front 0.3 ± punctate 



and almost smooth 3. arizonicum, new species 



Hind tibia ferruginous or fuscoferruginous, not at all yellow; mesopleurum of 

 male mostly wrinkled; metapleurum of female entirely wrinkled. 



4. densum, new species 



6. Hind tibia blackish 6. rubriceps Cresson 



Hind tibia yellow 7 



7. Propodeum beyond basal carina with coarse, dense punctures, without trans- 



verse wrinkles but in males usually with some longitudinal wrinkles; fourth 

 and following tergites of female light brown 7. apicale Cresson 



