444 REPORT OF STATE GEOLOGIST. 



ing the sub-families, it is surely of generic value. I therefore sepa- 

 rate our species into two genera, wliidi nuiy be distinguished as 

 follows: 



KEY TO GENERA OF INDIANA CECANTHIN^. 



a. Hind tibiae armed with weali spines, and small teeth between the 

 spines; first joint of antennjc smooth; inner wings but little, if any 



longer than the togmina LVIII. (Ecanthus, p. 444 



an. Hind tibino unarmed; first joint of tlic antenna; armed with a stout, 

 blunt tooth in front; inner wings nearly twice as long as the teg- 

 mina LIX. Xabea, p. 453 



LVIII. (Ecanthus Serville (1831). 



The main characters of this genus have been given under the sub- 

 family heading and in the above key. The tegmina of the female 

 are regularly reticulated, with the oblique longitudinal veins plainly 

 visible. The mediastinal vein of the male tegmina is not strongly 

 bowed, and the humeral angle is distinct. The tarsi are imper- 

 fectly four-jointed, the division between the third and fourth 

 joints being visible, but the fourth joint is seldom movable by itself. 

 The name (Ecanthus, signifying "I dwell in the flowers,'" is not al- 

 ways true as the insects are as often found upon the foliage of plants 

 as in the flowers proper. Five species occur in Indiana and may be 

 separated by the following table: 



KEY TO INDIANA SPECIES OF OSCANTHUS. 



a. Antennae without black marks on the under side of the first two 

 joints; tegmina of male more than half as broad as long; front of 



head and basal joints of antennae usually pinkish 



139 latipennis, p. 445 



aa. Antennaj with one or more black marks or spots on the under side of 



the first two joints; tegmina of male less than half as broad as long; 



front of head and basal antennal joints never pinkish. 



b. Antenna; with but one black mark on each of the two basal 



joints. 



c. Black marks on antenna; in the form of small rounded 



dots 140 niveiis, p. 446 



cc. Mark on finst joint of antenna\ long and hooked at base, 

 that on the second joint oblong; wing covers of male 



narrower and tibial spines weaker than in niveus 



141 angxistipennis, p. 450 

 hh. Antenna; either wholly black or with two black marks on each 

 of the two basal joints. 



d. Head and thorax, either black or trifasciate with black; 



antennoe usually black; when pale, the marks on first 



joint generally connected at apex. 



142 fasciatus, p. 450 



