REHN AND HEBARD 223 ^ 



A STUDY OF THE NORTH AMERICAN EUMASTACINAE -« 



(ORTHOPTERA; ACRIDIDAE) V^> 'vjCT-^^^^* 



BY JAMES A. G. REHN AND MORGAN HEBARD ^ \%*V^ 



The subfamily Eumastacinae is an assemblage of grasshoppers 

 which to-day comprises about forty-five genera and approximately 

 one hundred and fifty species. The group is clearly of tropical 

 origin, and is represented by a far greater number of forms in 

 both the Oriental and African regions than in the American trop- 

 ics. In the Old World representatives are found as far north as" 

 Turkestan, Kashmir, Bhotan, Yunnan, China and Japan, while 

 in Africa no species have been reported from north of the tropical 

 area. In North America, north of Mexico, a single genus and 

 species has been known from California for some years, but since 

 its description in 1898 little additional information has been 

 published regarding it. 



In the field studies made within the United States ])y the pres- 

 ent authors, we have always paid particular attention to eumas- 

 tacids when we found them present at a locality. In consequence 

 we have before us a very considerable series of the subfamily 

 from the United States, largely of our own collecting and 

 all contained in the Philadelphia collections. Careful study 

 shows that two genera are present, Morsea, which was previously 

 known, and a new one related to it, while the single species of 

 Morsea is found divisible into three geographic races, one of 

 which is found considerably to the eastward of the previously 

 known range of the genus. 



The features of the subfamily have been discussed l)y Burr in 

 his last summary of the group. ^ At this writing, without a 

 broader personal knowledge of the exotic genera, it seems unde- 

 sirable to re-diagnose the subfamily, the recognition of which 

 will not cause difficulty on account of the distinctive and in fact 

 often remarkable form of the species. 



In the United States the sul)family occurs only in the south- 

 western states, north as far as the vicinity of San Francisco (.Mt. 

 Tamalpais), Cahfornia, southeastern Nevada (Crestline and 

 Caliente) and from the Pacific Coast area east to central Arizona 



1 Genera Insect., Orth., Eumastac, pp. I to 2, (1903). 



TRANS. AM. ENT. SOC, XLIV. 



