1918.] NATURAL SCIENCES OF PHILADELPHIA. 161 



Blattinae. 

 Periplaneta americana (Linnaeus). 



1758. [Blatta] americana Linnaeus, Syst. Nat., X ed., p. 424. ["America."] 



Igarape-assii. One female. 



Periplaneta australasiae (Fabricius). 



1775. [Blatta] australasice Fabricius, Syst. Entom., p. 271. ["In nave e 

 mari pacifico et regionibus incognitis revertente."] 



Igarape-assii. January 7, 1912. One female. 



Panchlorinae. 

 PancMora^* exoleta Burmeister. 



1838. P[anchlora] exoleta Burmeister, Handb. der Entom., II, abth. II, 

 pt. 1, p. 507. [Pard, and Bahia, Brazil.] 



Igarape-assii. February 25, 1912. Two males, one female. 



Panchlora bidentula Hebard. 



1916. Panchlora bidentula Hebard, Entom. News, XXVII, p. 221, fig. 1. 

 [Igarape-assii, State of Para, Brazil.] 



Igarape-assii. January 17, 1912 (type), no date (paratype). Two 



males. 



OorydiinsB. 



Melestora minutissima n. sp. (PI. I, fig.s. 22, 23.) 



This is the smallest form of the genus, being decidedly under the 

 size of the three previously known species, i. e., adspersipennis and 

 fuscella Stal from Rio de Janeiro SLnd fulvella Rehn from the Misiones, 

 Argentina. Aside from the much inferior size, it differs from adsper- 

 sipennis in the much less transverse pronotum, in the non-sulcate 

 character of the median area of the same and in the dark and less 

 varied coloration. From fuscella the new species also differs in the 

 non-sulcate median section of the pronotum and in the non-pellucid 

 character of the lateral portions of the same. From fulvella, with the 

 type of which the new form has been compared, the present species 

 also differs in the less strongly transverse and more ovate pronotum, 

 in the tegminal venation becoming obsolete distad, in the relatively 

 longer caudal tarsi and in the fuscous coloration. 



Type: cf ; Igarape-assii, State of Para, Brazil. (H. S. Parish.) 

 [Acad. Nat. Sci. Phila., Type no. 5248.] 



Size very small: form elongate ovate, depressed: surface moder- 

 ately polished, regularly but sparsely clothed with silky pile. Head 

 visible cephalad of the pronotum, the outline of the occiput and head 

 arcuate; interspace between the eyes very broad, imiform in width, 

 which is subequal to the greatest depth of the eye, surface of the inter- 



^' For comments on the important characters for diagnostic use in this genus, 

 as well as the svnonvmy of many of the nominal species of the same, see Hebard, 

 Entom. News, XXVII," pp. 217 to 221, (1916). 



