OMMdFTERA OP INDIANA. 169 



brood over the eggs, but to abandon the young as soon as hatched. 

 In this she resembles some of our common myriapods of the genus 

 Lithohius, which are often found beneath logs and rubbish curled up 

 around their eggs, but which are never seen in company with the 

 young. 



Earwigs are common in the cities along the seacoast, especially 

 those of the Southern States and tropical and semi-tropical countries. 

 Inland, especially in temperate and c'old regions, they are scarce. 

 The family is not, as yet, divided into sub-families. Six genera and 

 fourteen species are listed by Scudder from the United States. Of 

 these, three species, representing two genera, have been taken in In- 

 diana. They belong to that division of the family in which the sixth 

 joint of antennae is as long ds, or very nearly as long as, the first. 

 The following key will serve to separate the two genera: 



KEY TO GENEKA OF INDIANA FOKFICULID^. 



a. Sixth joint of antennae cylindrical, many times longer than broad; 

 second tarsal joint produced beneath the third 



I. FORFICULA, p. 1G9 



aa. Sixth joint of antennae plainly obconic, about three times as long as 



broad. Second tarsal joint minute, simple, compressed 



II. Labia, p. 171 



I. FoKFicuLA Linnseus (1758). 



Size, medium; whole body more or less flattened, rather long and 

 slender. Antennae a little more than half as long as the body, 10 to 

 14-jointed, the joints cylindrical, more than four times as long as 

 broad. Abdomen not expanded in the middle; all the dorsal segments 

 before the last, of nearly equal length in both sexes. First tarsal 

 joint a little longer than the third; the second short, dilated at the 

 apex and lobed, passing beneath the third joint. 



This genus is the richest in species of any of the family, and is 

 more widely spread than any, being found wherever earwigs occur. 

 Six species belonging to it are known from the United States, two of 

 which have been taken in Indiana. These may be separated by the 

 following: 



KEY TO INDIANA SPECIES OF FORFICULA. 



a. Wings wanting; antennae 12-jointed. 1 ociilcata, p. 170 



aa. Wings protruding beyond the tips of tegmiua; antennae 14-15-jointed. 



2 auricnlaria, p. 170 



4l-Geol. 



