2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ID/ 



Tribe DICTYOPHARINI 



Genus HYDRIENA Melichar 



Hydriena Melichar, 1912, Abh. Zool. Bot. Ges. Wien, vol. 7, No. i, p. 50. 

 (Orthotype, H. distanti Melichar, ibid.) 



HYDRIENA FERRUGINEA (Walker), new combination 



Plate 2, figures 24-26 



Dichoptera ferruginea Walker, 185 i. List Horn., vol. 2, p. 305. 

 Hydriena distanti Melichar, 1912, Abh. Zool. Bot. Ges. Wien, vol. 7, No. i, 

 p. 50. 



Post-tibiae with 5 spines. Tegmina with M forked once in corium ; 

 Stigma 4-celIecl ; 3 rows of areoles in membrane, 18 areoles along 

 apical margin. 



The figures are of Walker's holotype. 



Genus MEGADICTYA Melichar 



Megadictya Melichar, 1912, Abh. Zool. Bot. Ges. Wien, vol. 7, No. i, p. 64. 

 (Orthotype, M. multispinosa Melichar, ibid.) 



MEGADICTYA OBTUSIFRONS (Walker), new combination 



Plate 2, figures 21-23 



Dictyophara obtusifrons Walker, 1851, List Horn., vol. 2, p. 318. 

 Megadictya multispinosa Melichar, 1812, Abh. Zool. Bot. Ges. Wien, vol. 7, 

 No. I, p. 64. 



Vertex conical in outline, longer than broad ( i . i : i ) . Post-tibiae 

 with 5 spines, Tegmina about 13 mm. long, corium occupying less than 

 half of total area; M 3-I-4 forked before nodal line, stigma 6- or 7- 

 celled; 10 rows of transverse veins distad of nodal line, 22 areoles 

 along apical margin. Pygofer with a straight slender spine at dorsal 

 ends of posterior margin, directed posteriorly and downward. 



The figures and data are based on Walker's holotype. 



The discovery of the true generic position of D. obtusifrons was 

 most unexpected, as the species figured under this name in the Biologia 

 Centrali-Americana is a characteristic Hyalodictyon. Careful com- 

 parison of Walker's description with the holotype leaves no doubt of 

 their perfect agreement. Among other characters Walker mentions 

 a "short luteous stripe" along the lateral margin of the prothorax ; the 

 type has an opaque yellowish stripe in this position, which, through 



