70 IOWA STUDIES IN NATURAL HISTORY 
snake-Master, or Button Snake-root (Hryngiwm yuccaefolium 
Michx.).’’ I have not taken nymphs of this bug in Iowa. 
Trichopepla atricornis Stal 
1872. Trichopepla atricornis Stal, Svensk. Vet. Handl., 10, no. 4, 34. 
1904. Trichopepla atricornis Van Duzee, Trans. Am. Ent. Soc., XXX, 35. 
1909. Trichopepla atricornis Kirkaldy, Cat. Hem. (Heterop.), I, 49. 
Closely allied to ZT. semivittata and resembling that species in general 
but differing from it in the following characters: General form averag- 
ing slightly wider. Head broader, more distinctly sinuate in front of eyes. 
Antennae entirely black, the tubercles only pale. Pronotum proportion- 
ately longer and the lateral margins less oblique. Adults with connexivum 
black, the margin sometimes entirely pale and scalloped within; in some 
specimens the connexivum is alternated as in T. semivittata. Membrane of 
hemelytra averaging darker than in that species. Tarsi black. Length, 
7.0-9.5 mm. Width across pronotum, 4.0-5.25 mm. 
In addition to the above, my specimens of this form average 
darker and more pilose than the preceding species and the ros- 
trum is also shorter than in 7’. semivittata. 
Trichopepla atricornis seems to be even less common than its 
congener and but four specimens are in my collection from 
Towa City and Lake Okoboji. The two lowa City specimens 
were taken on July 9 from wild carrot (Daucus carota Linn.) 
srowing in a vacant lot within the city limits. One of the 
Lake Okoboji specimens was taken on low grass near Hayward’s 
Bay, July 8. Osborn recorded the species from Little Rock 
and Ames. In its general distribution it is more characteristic 
of the northern and western states than is the preceding species. 
Genus RHYTIDOLOMIA Stal ; 
1872. Ruyripotomia Stal, Svensk. Vet. Handl., 10, no. 4, 33. 
This and the following genus are very closely allied and both 
have, at one time and another been given subgeneric rank under 
the generic name Lioderma erected by Uhler. Both genera have 
also been included by many authors under the name Pentatoma 
in which case Lioderma has been accorded subgeneric rank 
along with Rhytidolomia and Chlorochroa. However, the Lno- 
derma of Uhler has been found to be preoccupied so that, the 
subgenera Rhytidolomia and Chlorochroa of Stal having been 
raised to generic rank, they become available for receiving these 
Seutelleroidea. 
