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27), not pigmented; abdominal segment I short and broad, sternite broader than long (Fig. 96) ; tergite I not overlapping sternite ventrally (Fig. 96) ; abdominal segment II bellshaped, broader than long except in rttbicttnd~tltts; no median basal suture on sternite II; male genitalia as in Fig. 73-84, 97-100. Included species are L. , and zacateots. This group is essentially N earctic with only a single species recorded from the N eotropical Region. The greater part of the group is found in the semiarid regions of southwestern North America.

3 Interocellar area evenly punctured, or if with raised lobes, then surface of swellings pitted 4 Tergite V and sternite III black; upper propodeal lamella apically narrowed chiricahua Parker Tergite V and sternite III with apical yellow bands; upper propodeal lamella broad, flared . · trachysomus (Bohart) Markings pale ivory; c1ypeus with wide, apical emargination (Fig. 5 times wider than long, ~ell shaped; c1ypeal emargination narrow (Fig. ~o) · rufinodus (Cresson) Tergite II as broad as long; apical emarginatioll wide (Fig.

116). Furthermore, the hind tibia is colored in acolhtltls, whereas the tibia is entirely black and the clypeal emargination is wide in the other 2 species. Leptochilus 193 punctures d~ep, moderate on -h~ad and thorax; pits on summits of tergites very shallow, indistinct, open behind; tergites III-VI without macropunctation. Clypeus broadly produced apically, with wide shallow U-shaped median emargination, lateral margin almost straight; antennal hook thin, flattened" wide, short, fitting into j:Jasin formed by apical depression of flagellomere IX; occipital carina slightly raised; pronotal carina raised along entire length, weakly projecting laterally, continuous; upper propodeal lamella broad, flared, apex widely rounded; mid femur depressed both apicodorsally and basoventrally; in profile, tergite I depressed medially; tergite II not indented nor swollen by pit row; sternite II with faint median basal suture; genitalia as in Fig.

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A Revision of the North American Species in the Genus Leptochilus (Hymenoptera: Eumenidae) by Frank Downs Parker

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