1921] NATURAL SCIENCES OF PHILADELPHIA. 255 



given by Saussure. With a species subject to as great size variation 

 as is shown bj^the two specimens, here associated without hesitation, 

 as representing the same species, we feel that we are justified in re- 

 ferring this material to Saussure 's hilohata. Saussure has des- 

 cribed two decided color variations for that species. The two 

 specimens before us agree closely in coloration. 



Length of body cf 41.8, 9 36.7; length of pronotum d^ 16.7, 9 

 11.7; width of pronotum cf 19.5, 9 16; length of exposed portion 

 of tegmen cf 11.7, 9 8; width of tegmen cf 9.8, 9 7.7; width of 

 interval between tegmina cf 7.5, 9 5.5 mm. 



Section III. Northern Argentina. 



The collection from this region, belonging to the Paris Museum, 

 is large and to it have been added a considerable series from the 

 the Hebard Collection, originally the property of Professor Law- 

 rence Bruner. A total of 370 specimens has been recorded, in- 

 cluding 22 genera and 37 species, of which 2 genera and 16 species 

 are new. 



As a result we have been able to study a much larger series of 

 Argentinian Blattidae than has ever previously been assembled. 

 The species recorded from the subtropical section of northern Ar- 

 gentina represent we believe, a fairly large proportion of the cock- 

 roaches which there occur. 



Though the Blattidae of Argentina have been by no means ne- 

 glected in past literature, the fact that over forty-five percent of 

 the species here treated represent new forms, shows that this 

 family has previously received scant attention by collectors. The 

 extremely rich fauna of southern Brazil is continued into tropical 

 northern Argentina, and it is probable that but a small proportion 

 of the Blattidae of that region are as yet known. 



Of particular interest are the brachypterous species of the genera 

 Carihlatta and Neohlattella, the large number of species of the genus 

 Ischnoptera ( of which the species caracana shows extraordinary 

 male dimorphism), the distinctive PseudiscJuioptera rhabdota,the 

 species of Epilarnpra in which the sexes show decided to very great 

 dissimilarity and the five small species of the Corydiinae. 



Eudromiella aglaia new sijecies. Plate IX, figures 4 and 5. 



Males of the present species agree closely with males of the geno- 

 type,^, hicolorata Hebard, described from Panama, differing in the 

 more contrasting coloration, the pronotum with paired longitudinal 



