212 FAMILY vi. ACRIDID;E. THE LOCUSTS. 



valleys." They first called attention to the marked dimorphism 

 in the species, but stated that "between the two types are numer- 

 ous individuals which seeni to bridge more or less completely the 

 gap between the extremes." Later (1016, 159) they stated that 

 159 adults in their collection showed that "individuals having a 

 strongly defined median pronotal stripe have strongly defined 

 supplementary carinse, while those having the dorsum of the pro- 

 iiotum unicolorous wholly lack supplementary carina?." This is 

 true of the series at hand from which the above description was 

 drawn up. Fox says that "both forms are frequent at Charlottes- 

 ville, Va., the typical form being the more abundant. Both have 

 the same habitat preferences and life histories and are almost in- 

 variably associated with each other. Although typical examples 

 of both races are common, the writer has never found any individ- 

 uals bridging the gap between them." As both these authorities 

 assert that the absence of supplementary carina? on the pronotum 

 is (ilicays associated with a lack of the dorsal dark stripes, this 

 fact is evidence that the atypical form possessing these characters 

 is at least a distinct variety or color phase. Since it has no name, 

 I herewith propose for it that of dorsalis var. nov. 



The Goinphocerus carinatus of Scudder (1875g, 511). a name 

 based on a three-line footnote, has been placed as a synonym of 

 E. simplex by R. & H. (1910a, 026). It is the Eritettix carinatus 

 of Britton (1904), of Walden (1911), of Morse (1907), and of 

 Allard (1916). The last named author has given a description of 

 its stridulating habits as follows : "I first met this little Acridian 

 early in April at Thompson's Mills, Ga., in an old pasture grown 

 up to broom grass. Tt keeps well down in the grass, moving about 

 occasionally to stridulate. If it leaps and alights near the top of 

 a grass stalk, it moves backward down the stalk until near the 

 ground. Its notes are faint, lisping phrases of a few seconds 

 duration, and are at intervals repeated six or eight times in quick 

 succession : sic-a-sic-a-sic-a-sic-a-sic-a-sic sic-a-sic-a-sic-a-sic, etc. 

 This grasshopper is most active when the sun is shining. Its notes 

 resemble those of Xtenobotlims ciii-tipcmnis very much, and are 

 produced in the same manner by sawing both thighs simultane- 

 ously upon the edges of the tegmina." 



IIT. PKDKTHTM McXeill, 1S97, 216. (Or., "a leaper.") 



Species of small size having the head horizontal, occiput with 

 supplementary carin.p as in Eritctli.r; vertex short with sides 

 raised and rounded or subangulate, median carina strong, apex 



