1907.] NATURAL SCIENCES OF PHILADKLI'IIIA. 181 



Adimantus vitticeps (Blanclinnl). 



1846. Acridium vitticeps Blanchard, in D'Orbigny, Voy. lAiiiir. Mcrid., 

 VI, pt. II, p. 21G, pi. XXVII, fig. 4. [No locality cited.] 



3(^,4 9. March, 1905. 



This series shows considerable variation in the suffusion of vermihon 

 on the cephahc and median hmbs, and also in the extent and intensity 

 of the same color on the caudal tibife, one specimen having these in the 

 greater part greenish and bluish black. In all the specimens the 

 caudal tibite bear two median, more or less complete, annuli of bluish 

 or bluish black. 



Rurmeister's Oxya oi^notissiina is probably distinct from this species, 

 having, according to the original description, blue wings. 



ZYGOCLISTRON Rehn. 

 1905. Zygoclistron Rehn, Entom. News, XVI, p. 39. 

 Type. — Z. trachystidum Rehn. 

 Zygoclistron traohystictum Rehn. 



1905. ZygocUfitron trachystictum Rehn, Entom. News, X\'I, p. 39, figs. 1, 2 

 and 3. [8apucay, Paraguay.] 



12 c5^, 9 9 . January to March, 1905. 



This series shows that while color variation in the species is sUght, 

 the female sex exhibits a considerable amount of individual variation 

 in size, the smallest measuring 10.2, 19 and 20.5 millimeters in the 

 length of the pronotum, tegmen and caudal femur respectively, the 

 largest having these parts 12.5, 21.5 and 24.5. 

 ♦Zygoclistron superbum n. sp. 



Types: o^ and ?; Sapucay, Paraguay. December 16, 1904 (9), 

 March 5, 1905 (c?). (William Foster.) [Hebard Collection.] 



Allied to Z. trachystictum but differing in the more produced, more 

 acute and more excavate fastigium, the less regularly divergent mar- 

 gins of the frontal costa, the more ovate eyes, the longer tegmina and 

 wings (particularly in the female) and in the presence of maculations 

 on the dorsum of the pronotum. 



Size rather large; form moderately elongate; surface of head and 

 abdomen smooth, of thorax rugulose. Head with the occiput not 

 elevated to the level of the disk of the pronotum, slightly rounded and 

 gently declivent to the fastigium, interocular region slightly narrower 

 than the width of the eye in the male and equal to two-thirds the 

 length of the eye in the female; fastigium with the apical margin slightly 

 acute-angulate in both sexes, the immediate apex sharply defined , disk of 

 the fastigium broader proportionateU'and less defined in the female than 

 in the male, distinctly but not greatly excavate in the male, hardly so in 

 13 



