136. Memoirs of the Indian Museum. [Voi.. Ill, 



broad at the tip. Wings with extended brown pattern with hyaHne indentations and 

 spots, or with isolated black spots. 



Type : V. impressi/rons , R.-D., 1830. 



The genus is placed here, notwithstanding the resemblance of one species to 

 Rioxa, in respect of the very characteristic armature of the frons in the male, which 

 is very like that to be observed in the ^niopesm Stemonocera cornuta, Scop., and in 

 the North American Straussia longipennis , Wied. ; both these genera are evidently 

 related to Spilographa. 



The two species are to be distinguished as follows : — . , 



1 (2). Superior edges of the frons elevated in the shape of two flattened horns ; 



or. 2. I, the two superiors being incrassated and rigid ; abdomen black 



at the end ; wing-pattern of the Rioxa tj'pe. . . . . . . ceratophoya, n. sp. 



2 (i). Inferior edges of the frons elevated; or. 2. 4, the last three inferior 



being incrassated and rigid; abdomen entirely yellow; wing-pattern of 



the Spilographa type . . . . . . . . . . . . triceratops, n. sp. 



41. Vidalia ceratophora, n. Sp. c? . 



(PI. ix, fig. 42). 



Easily distinguished from the type species of the genus, as descrbied by Desvoidy, 

 by the base of the abdomen and the femora being wholly yellow. Length 5 mm. 



Head wholly yellow, with a small black ocellar dot ; antennae yellow, with some 

 black hairs at the base ; proboscis and palpi yellow, these last with some black bristles ; 

 the middle of the frons is opaque, but the vertical horns are shining ; all the bristles 

 are black, the single lower or. is placed at the base of the horns and curved forwards ; 

 on the sides of the frons are some small hairs disposed in a single row ; the two incras- 

 sated superior or. are placed at the tip of the horn and very close together, the first 

 being shorter and curved forwards, the second straight and longer. The 2 vt. are 

 situated at the interior base of the horn. 



Thorax wholly yellow, rather shining ; it seems to be a little cinereous on the 

 middle of the back ; a small yellowish white streak is to be seen along the noto- 

 pleural suture ; pleura and metanotum yellow, shining, unspotted ; all the bristles 

 are black, only the middle pair of scp. being yellowish. Scutellum light yellow, shin- 

 ing. Squamulae and haltères yellowish. Abdomen shining, with black bristles ; 

 the three first segments are reddish -yellow, the last two black : the pubescence is 

 pale on the reddish portion and black on the black. Belly reddish, black at tip ; 

 genitalia prominent, of reddish colour. Legs wholly yellow ; front femora with 5-6 

 black bristles beneath ; hairs of the hind tibiae black. 



Wings brownish black, with the base narrowly hyaline. Costal cell h}^ aline, 

 with a brown spot on the humeral cross- vein ; stigma wholly black. At the fore 

 border are two hyaline indentations, close together, one just after the stigma, ex- 

 tending to the third vein, the other reaching the middle of the first posterior cell just 

 after the small cross-vein. At the hind border are two triangular hyaline indentations, 

 one in the base of the second posterior cell and one after this in the apex of the third 



