14 
THE CHINCH BUG. 
differs front that of the mature hug, being but slightly more elongate ; but the tarsi 
have but two joints (Fig. 4 d), and the head is relatively broader and more rounded, 
while the joints of body are sub-equal, the prothoracic joint being but slightly longer 
than any of the rest. The red color soon pervades the whole body, except the first 
two abdominal joints, which remain yellowish, and the members, which remain pale. 
After the first molt (Fig. le) the red is quite bright vermilion, contrasting strongly 
with the pale band across the middle of the body, the prothoracic joint is relatively 
longer, and the metathoracic relatively shorter. The head and prothorax are dusky 
and coriaceous, and two broad marks on mesothorax, two smaller ones on metathorax, 
two on the fourth and fifth abdominal sutures, and one at tip of abdomen are gen- 
erally visible, but sometimes obsolete; the third and fourth joints of antennae are 
dusky, but the legs still pale. After the second molt (Fig. 1/) the head and thorax are 
quite dusky, and the abdomen duller red, but the pale transverse band is still dis- 
tinct ; the wing-pads become apparent, the members are more dusky, there is a dark 
red shade on the fourth and fifth abdominal joints, and, ventrally, a distinct circular 
dusky spot covering the last three joints. 
Fig. 1. 
Immature stages of Chinch Bug. — a , b, eggs ; c, newly-hatched larva ; d, its tarsus ; e, larva after 
lirst ruolt ; /, same after second molt; <j, pupa— the natural sizes indicated at sides ; k, enlarged leg of 
perfect bug; j, tarsus of same still more enlarged ; i, proboscis or beak, enlarged.— [After Riley.] 
Pupa. — (Fig. 1,0.) In the pupa the coriaceous parts are brown-black, the wing- 
pads extend almost across the two pale abdominal joints which are now more dingy, 
while the general color of the abdomen is dingy gray ; the body above is slightly 
pubescent, the members are colored as in the mature bug; the three-jointed tarsus is 
foreshadowed, and the dark horny spots at tip of abdomen, both above and below, 
are larger. 
Imago. — (Fig. 2.) The perfect insect has been well described 
[Fig. 2.] and j w i]l append the original description : 
Lygaeus leucopterus (Chinch Bug). Blackish ; hemelytra 
white, with a black spot. 
Inhabits Virginia. 
Body long, blackish, with numerous hairs. Antenme, 
rather short hairs; second joint yellowish, longer than the 
third ; ultimate joint rather longer than the second, thickest ; 
thorax tinged cinereous before, with the basal edge piceous ; 
hemelytra white, with a blackish oval spot on the lateral mid- 
dle; rostrum and feet honey yellow ; thighs a little dilated. 
Length less than three-twentieths of an inch. 
I took a single specimen on the eastern shore of Virginia. 
The whiteness of the hemelytra, in which is a blackish 
spot strongly contrasted distinguishes this species readily 
(feay, Am. Entomology, I, p. 329). 
The above description originally appeared in 1832 in a pam- 
phlet entitled “Descriptions of new species of Heteropterous 
Chinch Bug: Hairline un- 
derneath showing natu- 
ral size. [Alter Riley.] 
Hemiptera of N. A. ! 
