118 HELICONIDiE. 



obliquely inwards to the discoidal nervure, which extends considerably into the cell, and is 

 bent downwards after its anastomosis with the upper disco-cellular, and again bent, almost 

 at a right angle, where it anastomoses with the short lower disco-cellular. Third submedian 

 nervule bent at a considerable angle, where it is joined by the lower disco-cellular. 

 Anterior Legs of the males very short. Tibia and tarsus only represented by a small knob. 

 Anterior Legs of the females with the femora and tibia? nearly equal in length. The tarsi 

 shorter, four-jointed; the basal joint long, cylindric ; second joint about one third the length of 

 the first, cylindric ; third joint less than one fourth the length of the first, cylindric, armed at 

 the apex with two strong spines ; fourth joint very short, subquadrate, furnished at the base 

 with two tufts of stiff converging hairs, which overlie the spines of the preceding joints. 

 Middle and Posterior Legs with the tibia? and tarsi about equal in length, the femora rather 

 shorter. Tibia? spiny, the spurs short. Tarsi very spiny, the lateral spines longest, those of 

 the upper and under surface not disposed in regular rows First joint long, equal to the rest 

 combined, nearly cylindrical, as is the second, which is only about one third the length of the 

 first ; third and fourtli joints progressively shorter, broader than the preceding, somewhat 

 ovate, or sub-cordate ; fifth rather longer than the fourth, elongate, oval. Claws rather small, 

 curved, grooved below. Paronychia bilaciniate ; the outer lacinia slender, almost linear, about 

 equal in length to the claw; inner lacinia short, broad, subtriangular. Pulvilli jointed, as 

 long as the claw. 

 Abdomen much longer than the inner margin of the posterior wings, clavate. 



Larva and Pupa unknown. 



Thyridia closely resembles the two preceding genera in form and external appearance. It has the same elongate, 

 mostly semitransparent wings, with a black border and black transverse markings ; the same distinctly clavate antennas, 

 whitish at the apex, and the clavate, elongate abdomen. It differs from both in the important characters of the 

 anterior legs in both sexes ; and also in the more rounded outer margin, not eiuarginate near the anal angle. 



The Larva of Thyridia Psidii is stated by Madame Merian to be smooth and green, and to feed on the guava ; 

 but not the slightest confidence is to be placed in her figure, which more probably represents that of some one of the 

 Noctuida?. 



This genus occurs in Brazil, Guiana, and Venezuela. Like the five preceding genera, it is very limited in the 

 number of species, but possibly, when the countries bordering on the Orinoco and the Amazons are more fully 

 investigated, other species will occur. 



THYRIDIA. 



1. Thy. Psidii Hiibn. Verx. bek. Sehmett. 9. (1816). 



P. Psi. Linn. Syst. Nat. ii. 75f>. n. ()4. 

 Fab. Ent. Syst. m. i. 16.0. n. 525. 

 Cram. t. 257. f. F. 

 Hel. Psi. Godt. Enc. M. ix. 211. ii. 25. 

 Guiana, Brazil. B. M. 



2. Thy. jEof.ria Double/lay S>- Hewitson, t. Hi. f. 4. ( 1 8 1 G). 



Venezuela. B. M. 



