SCUTELLEROIDEA OF IOWA 15 
spot on each side of disc; orifices very distinct....TETYRINAE 
Venter without stridulating spot; orifices prolonged into a 
PROC MPO 5 OSs oe cee s dee es ODONTOTARSINAE 
Subfamily TETYRINAE (Stal) 
Most of the members of this subfamily are confined to the 
Nearctic and Neotropical regions. Two genera have represen- 
tatives in the Ethiopian and Oriental regions only. About 
twenty species which are included in nine genera occur in North 
America. Three species, all in the same genus, have been re- 
corded from Iowa. The principal differential characters are: 
Body generally convex below, more or less pubescent. Pronotum and 
scutellum forming a continuous curve at base (in the North American 
forms); posterior angles of pronotum obtuse, rounded. Meso- and meta- 
sterna not bordered by a carina. Orifices very distinct. Ventral incisures 
transverse, straight or bisinuate, at the sides curved rather abruptly before 
rejoining border of venter. An oblong, finely striated stridulating spot in 
both sexes on either side of the dise of at least the fourth and fifth visible 
ventral segments. 
Genus HOMAEMUS Dallas 
1851. Hemarmus Dallas, List Hem., I, 36. 
Body ovate, somewhat convex. Head longer than broad but shorter 
than pronotum, rounded in front, lateral margins nearly straight, some- 
what sinuate in front of eyes. Rostrum attaining second visible ventral 
abdominal segment and with the second segment as long as the third and 
fourth together, the fourth segment a little shorter than the third. An- 
tennae of five segments, the first and second subequal, second segment 
shorter than third, fourth and fifth segments about equal and longer than 
the third. Anterior margin of prostethus forming flaps covering the bases 
of antennae. Orifices prolonged into a groove. Scutellum attaining apex 
of abdomen. Venter with sides convex, the borders depressed. Tibiae 
grooved on superior surface. 
Key to the species 
Dilated anterior margin of prostethus rounded, not forming an 
obtuse angle beneath antennal tubercles 
Anterior prolongation of sixth visible ventral segment broad, 
distinctly angled; head generally bronze-black, devoid of pale 
submarginal vittae and without pubescence; sexes similar; 
BRA eee 9 OM MMI sh cock ada esi ials oe Stee ates aeneifrons 
Anterior prolongation of sixth visible ventral segment 
rounded; head generally with pale submarginal vittae and 
