<Unknown Taxon>

Erwin, Terry L., 1973, Studies of the subtribe Tachyina (Coleoptera: Carabidae: Bembidiini), Part I: A revision of the Neotropical genus Xystosomus Schaum, Smithsonian Contributions to Zoology 140, pp. 1-39 : 23

The microtretus group

The members of the microtretus group are characterized by their small eyes, the lack of anterior pair of lateral setigerous pores on the pronotum,

the presence of rudimentary laterobasal carinae on the pronotum, nonsulcate prosternum, fully developed flight wings, more broadly dilated articles of the male anterior tarsi, form of the recurrent groove, and peculiar male genitalia. When more specimens, and perhaps additional species, are known of this group, a subgeneric designation may be necessary.

The group presently consists of two species, one in Costa Rica and one in Brazil ( Figure 70 ).

Figures

FIGURE 70 Approximate ranges of the elaphrinus group (crosshatched area) and the micro- tretus group (solid areas).