THE SPINE-BREASTED LOCUSTS. 
173 
I. Acrtdium. Spine-hreasted Locusts. 
This word, which is nearly the same as one of the Greek 
names of a locust, has been variously applied by different 
entomolomsts. I have followed Latreille and Serville in con- 
fining it to those locusts which have a projecting spine or 
tubercle in the middle of the fore part of the breast between 
the fore legs. To this genus belong the following native 
species. 
1. Acrydium alutaceum. Leather-colored Locust. 
Dirty brownish yellow; a paler yellow stripe on the top 
of the head and thorax; a slightly elevated longitudinal line 
on the top of the thorax; wdng-covers semi-transparent, with 
irregular brownish spots ; wings transparent, uncolored, netted 
wdth dirty yellow ; abdomen with transverse rows of minute 
blackish dots; hindmost thighs whitish within and without, 
the white portion bounded by a row of minute distant black 
dots, and crossed, herring-bone fashion, by numerous brown 
lines; hindmost shanks reddish, with yellowdsh-white spines, 
which are tipped with black. Length, to the end of the ab¬ 
domen, 1| inch; the wing-covers expand over 3 inches. 
This insect 'svas brought to me, from Martha’s Vineyard, 
by Mr. Robert Treat Paine. It bears a close resemblance in 
form to Acrydium Americanum of De Geer,^ a much larger 
and more showy Southern species. 
2. Acrydium. jiavo-vittatum? Yellow-striped Locust. 
Dull green or olive-colored, wdth a yellowish line on each 
side from the forehead to the tips of the wing-covers; hind- 
what elevated crest; a spine between the fore legs on the breast; wing-covers and 
wings much shorter than the abdomen. 
The first two of these genera seem to connect the cone-headed grasshoppers with 
the locust family, while the last two approach nearer to the genus Acrydium^ 
many foreign genera, however, are interposed between them. 
[ 8 This reference to De Geer is incorrect, no such species being found in his 
works; it may refer to Drury. Illustrations I. pi. 49, f. 2. — Uhler ] 
[9 This insect was previously described by Say, who calls it A. bivittatus. 
The difference between the species, as found in New England and that of the 
