70 - CHINCH-BUG FAMILY. 
FAMILY LYGAEIDAE. 
(Chinch-bug Family). 
This is another family of true bugs, divided into nine sub- 
families, which differ from each other chiefly in details of the 
parts of the prothorax. It includes species closely resembling 
the members of the preceding family in size, form, and strongly 
contrasting colors, yet the great majority are smaller and less 
gaudily colored and marked; but all differ from that family by 
the possession of distinct ocelli. The membrane of the wing- 
covers (see illustration in text) possesses four or five simple 
veins which arise from its base; the antennz are inserted below 
an ideal line extending from the eye to the base of the beak, 
and the vertex is not constricted in front of the ocelli. 
Upper wing of 
Lygeide. 
Fic. 61.—Lygezus turcicus Fab. Fic. 60.—Oncopeltus fasciatus Dall. 
Original. After Uhler. 
As there are nearly fifty genera of such insects in the United 
States alone, many of which occur in our own state, it is of 
course impossible to describe them all, and only a few of the 
more important ones will be considered in these pages. In the 
sub-family Lygzina occur a number of large, chiefly red insects, 
banded with black across the wing-covers. 
Oncopeltus fasciatus Dallas (The Milk-weed Bug) is very 
common upon the larger kinds of milkweeds (Asclepias). , Like 
the other members of this sub-family it has the nearly conical 
head set well back in the prothorax, so that the eyes are directly 
in contact with the same. This bug has the legs, feelers, beak, 
