- 11 - 



developed egi^s, but some of the lighter colored ones showed 

 tliein in an advanced stage of development. 



In comparison with the Old World Scln'stocercii peregrina 

 our locust is a little shorter and narrower-winged ; has a slight- 

 ly smaller liead ; a somewhat longer and less constricted pro- 

 thorax; a trille heavier and longer hind thighs; a longer, thicker, 

 and more oblique prosternal spine. It is also quite distinct in 

 color. The peregrina shows but little indications of dark and 

 light lines or bands on prothorax and tegmina, while the mot- 

 tlings on the latter are larger and much more evenly distributed 

 over the whole wing. 



Fi'oni (unerica/ni the paranensis differs less in color, but is 

 more robust about the thorax and has a much larger head, a 

 smoother and more constricted prothorax, a smaller prosternal 

 spine, and shorter and lighter hind thighs. From caneellata , 

 which is a rather larger insect than americana, it differs in 

 as man}' respects as from the latter. The caneellata is, however, 

 a rather lighter colored insect than either americana or para- 

 nensis though it is marked in a similar manner to both. There 

 is also a greater difference in comparative size between the 

 sexes than there is in those species. It is also apparently normal 

 in its egg-laying and wintering habits ; / e. the eggs seem to be 

 laid during late summer and fall, and hatch in spring at about 

 the same time as those of paranensis. Hence it obtains its 

 wings and mingles with the last named. 



Egg-pod. — The hole or burrow which contains the egg-pod, 

 or "cartucho", as it is called in this countr^^ is from six to seven 

 centimeters in length from top to bottom. Of this depth the 

 eggs occup3' a little more than one-half of the lower end. The 

 entire burrow is a little curved, the lower end inclining to- 

 wards the insect's head as she stands while constructing it and 

 depositing her eggs. The diameter of this hole is approxi- 

 mately six and one-half millimeters for the upper two- iifths and 

 nine millimeters at its widest part where the eggs are contained. 

 There are normally from sixty to one hundred and twenty eggs 

 in one of these cartuchos; and in their arrangement are quite 

 regular as can be seen by a reference to the illustration ( Fig. 

 b) which is ideal. In comparison with the eggs of the destruct- 

 ive locust of North America, Melanopliis spretus. those of 

 paranensis are somewhat larger but more slender. They are 

 not so regularl}' arranged, however, as we ñnd them in spretus, 

 but much more so than those of americana with which they 

 agree in size and form. 



