1921] NATURAL SCIENCES OF PHILADELPHIA. 201 



longer spines in homologous portion of margin. Caudal metatarsus 

 one and one-quarter times as long as combined length of succeeding 

 joints. 



Head and palpi chestnut brown, obscurely vertically streaked 

 with paler on occiput, ocellar spots buffy. Antennae blackish 

 chestnut brown in proximal third, thence hazel. Pronotum black- 

 ish chestnut brown in large truncate-trigonal area, margined very 

 narrowly laterad with warm buff; lateral portions transparent, very 

 feebly tinged vdth buff. Tegmina weakly translucent, clear solid 

 hazel tinged with chestnut brown, particularly at the humeral trunk 

 and along the costal margin. Wings transparent, anterior field 

 tinged with saccardos umber, heaviest in area of enlarged portion 

 of costal veins, very weak between discoidal and ulnar veins except 

 distad and very weak between unbranched portion of ulnar vein 

 and anal sulcus; radiate field very weakly tinged with saccardos 

 umber, the veins of that color. Dorsal surface of mesonotum, 

 metanotum and abdomen shining and very dark chestnut brown. 

 Cerci dark chestnut brown. Ventral surface and limbs blackish, 

 the subgenital plate and limbs beyond the femora paling to very 

 dark chestnut brown. 



Length of body 15, length of antenna 18.8, length of pronotum 

 4, width of pronotum 5.7, length of tegmen 17.9, width of tegmen 

 5.9, length of wing 15, greatest width of costal field of wing 2, length 

 of cercus 2.9, length of caudal tibia 5.7, length of caudal metatarsus 

 2.1 mm. 



The type of this remarkable insect is unique. 



Euphyllodromia literata (Biirmeister) 



1838. Bl[atta] literata Burmeister, Handb. Ent., II, Abth. II, Pt. I, p. 497. 

 [Surinam [= French Guiana].] 



1839. Blaita alternans Serville, Hist. Nat. Ins., Orth., p. 114. [ 9 , Cayenne 

 [= French Guiana].] 



1903. Pseudophyllodromia pavonacea Rehn, Trans. Am. Ent. Soc, XXIX, 

 p. 262. [ cf ; Bartica, British Guiana.] 



Study of the Guianan material now in the Philadelphia collec- 

 tions and of the literature, furnishes much evidence indicating the 

 above synonymy. Rehn 's pavonacea was described at a time when 

 little material was available, and the generic association of the 

 American Blattidae in chaos. The description of Serville 's alter- 

 nans was thus apparently overlooked, while nothing could be done 

 with literata of Burmeister, until much Guianan material could 

 be secured. 



It is unfortunate that Burmeister 's wretched description of 

 literata, occupying less than two lines, has a year's priority over 

 Serville 's readily recognizable diagnosis of alternans. 



Nouveau Chantier, French Guiana, 1 cf . 



