248 
Sidney I. Kornhauser 
Botli species liave a wide distribution, being found practically all over 
the United States. I have examined not only my own speciniens, about 
800 of E. curvata and 310 of E. hinotata, collected in New York, Pennsyl- 
vania and Massachusetts, but also tlie collections of the Philadelphia 
Academy of Natural Sciences, those of IVIi'. I. JLvtausch, those in the 
Boston Society of Natimal History^ and those of the Museum of Com- 
parative Zoölogy. These collections include specimens from all parts 
of the United States. Both E. hinotata and E. curvata are extremely 
variable in external form. Especially is this true of the pronotal horn, 
which has been used by Stal as the basis for subdividing the older genus 
Enchenopa Am. et Serv. into subgenera, of which Carnpylenchia is one. 
Figure 6 (Plate XVIII) shows some of the more common variations of 
E. curvata. These specimens were selected from individuals all of which 
were gathered in the same field. My specimens of E. hinotata, however, 
were more constant, showing a much smaller ränge of Variation. Never- 
theless, I have secured some unusual forms from different localities, 
which are shown in Figure 5, Plate XVIII. The males in both species 
are smaller than the females, and have a shorter pronotal horn. The 
generic distinction between Enchenopa and Carnpylenchia is not satis- 
factory, being founded, as Professor E. D. Ball says, on “evanescent 
characters”. Mr. E. P. van Duzee States in a letter that the difference 
between Enchenopa and Carnpylenchia is merely one of degree of deve- 
lopment, and that it is all but impossible to di’aw a line between the two. 
In the present paper, I shall consider hinotata and curvata as species of 
the genus Enchenopa. 
Although each species, E. hinotata and E. curvata, is variable in 
itself, the two are certainly distinct species. E. hinotata has two yellow 
Spots 011 the back(Fig. 1, Plate XVIII, more distinct in the upper figure), 
while E. curvata is seif colored (Fig. 2, Plate XVIII). There are also cer- 
tain differences between the two in their habits of feeding and ovipositing. 
Both species deposit their eggs in the tissuc of the food plant and for 
this purpose are provided with long knife-like ovipositors, by which a 
slit is made in the steni or brauch. E. hinotata, living on the locust, has 
its ovipositor admirably adapted for cutting the hard bark and wood 
and spreading apart the edges of the cut for the reception of the eggs. 
The eggs are not placed so deeply in the tissue as those of E. curvata and 
the exposed ends are covered with a white sticky “frosting”, which is 
the product of a pair of large glands, one of which, with its reservoh’, 
is shown at gl.muc. in Figure 9 (Plate XVIII). E. curvata, on the other 
hand, lays its eggs in the pith of clover and other small non-woody plants; 
