288 PROCEEDINGS OF THE ACADEMY OF [May, 



length of pronotum, 19; greatest width of pronotum, 5.2; length of 

 tegmen, 52; length of cephalic femur, 14.7. 



This species, as far as can be determined from our correlation of 

 the published records, ranges from southern Brazil (Saussure) and 

 the Province of San Pedro, Paraguay (Giglio-Tos), south to Bahia 

 Blanca and the north of Patagonia (Saussure), west to Mendoza 

 Province (Chacras de Coria) and east to the Rio de la Plata (Buenos 

 Aires; Giglio-Tos). 

 Coptopteryx thoracica n. sp. 



1894.^ Coptopteryx gaiji Giglio-Tos (not of Blanchard), Boll. Mus. Zool. 

 Anat. Comp. Torino, IX, No. 184, p. 3. [Province of San Pedro, Paraguay; 

 Santa Rosa, Salta, Argentina.] 

 1907. Coptopteryx gayi Rehn (not of Blanchard), Proc. Acad. Nat. Sci. 

 Phila., 1907, p. 155. [Sapucay, Paraguay.] 



Type: 9 ; Sapucay, Paraguay. December 19, 1904. (William 

 Foster.) [Acad. Nat. Sci. Phila., type No. 5,215.] 



The differential characters of this form have been emphasized in 

 the key. 



Size large (for the genus); form less robust than in argentina. 

 Head trigonal, slightly broader than deep; occiput moderately 

 arcuate, the juxta-ocular sections subbullate and separated from the 

 occipital margin proper by moderately deep sulci, the dorsal portion 

 of the eyes considerably ventrad of these inflated sections; ocelli 

 small, placed in an arcuate line; facial shield strongly transverse, 

 the greatest depth contained about three times in the width of the 

 same, dorsal margin obtuse-angulate, lateral margins oblique trun- 

 cate; eyes moderately prominent, subovate in basal outline; antennae 

 short, filiform. Pronotum elongate, not strongly inflated, the greatest 

 width contained about four times in the length; lateral margins of 

 the collar and shaft closely and regularly spinose with nearly as 

 regularly placed intercalated spinulations ; collar having the cephalic 

 margin strongly arcuate with the middle slightly flattened, lateral 

 margins regularly expanding caudad to the well-rounded supracoxal 

 dilation; shaft with the margins narrowing more abruptly caudad of 

 the dilation than the collar expands to the same, thence caudad 

 apparently subequal, but in reality very slightly expanding to the 

 arcuate caudal margin, which is subtruncate mesad; transverse 

 sulcus deep, median carina finely but decidedly indicated, present 

 throughout the prothoracic length except for a very short distance 



9 It is quite probable that Coptopteryx gayi Gigli-Tos {Zoolog. Jahrb., Abth. 

 Syst., VIII, p. 805, 1895), listed without comment from Paraguay, is the same as 

 the present form. In the reference given in the above text the accompanying 

 description enables us to place the species without question, but in the Jahr- 

 biicher case we have no such aid. 



