. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Genus Stizus Latreille • Stubblefield 405 .^ ^"^"^ V A ^ ^^ ^ 100U M A r . TW 1 r-,j wLi V } mA • i I A. Figure 1. Apical enlargement of aedeagus in ventral view showing rows of minute teeth. A. occldentalis Parker. Stizus Iridis Dow. B. Stizus closely related to each other than either one is to the brevipennis group. The sco- laeformis group includes only a single un- usual species that could be viewed as rep- resenting a separate subgenus as noted by Arnold (1929). This species possesses a fe- male scutell
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Genus Stizus Latreille • Stubblefield 405 .^ ^"^"^ V A ^ ^^ ^ 100U M A r . TW 1 r-,j wLi V } mA • i I A. Figure 1. Apical enlargement of aedeagus in ventral view showing rows of minute teeth. A. occldentalis Parker. Stizus Iridis Dow. B. Stizus closely related to each other than either one is to the brevipennis group. The sco- laeformis group includes only a single un- usual species that could be viewed as rep- resenting a separate subgenus as noted by Arnold (1929). This species possesses a fe- male scutellar pit as in the ruficornis group, a well-marked female pygidial plate as in the brevipennis group and some members of the fasciatus group, a carina to each side of the median carina on ster- num I as in some Stizoides, and differs from all other species in having a much lengthened pronotum with an oblique an- terior face instead of a shorter pronotum forming a discoid collar. The North American Stizus represent two well-defined groups, the strictly Nearctic brevipennis group including S. brevipennis, S. texanus, and S. aztecus and the mostly Old World ruficornis group in- cluding S. occidentalis and S. iridis. Se- lected characters serving to distinguish the two groups are listed in Table 2. Several of the cited characters have not been not- ed by previous authors, and their distri- bution in the Old World species remains to be determined. It should be noted, however, that some of the characters cited for the North American species of the ruficornis group also occur in at least some members of the Old World fasciatus group. Flagellar tyloids, a broad and flat sternum VIII, and an evenly rounded dig- itus, for example, occur in both groups (see figs, in Mochi, 1939). Similarly, my dissections have revealed the presence of a carina on the inner surface of sternum VII in males of S. imperialis, S. marthae (=cheops), and S. vespiformis of the fas- ciatus group as well as S. co
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