8 GYPSOCHROA; ORTHOSTIXIS;CENTRONAXA. By L. B. Pkout. 



The fringe, which in falcataria is unmarked, is in mahillaria strongly spotted with fuscous at the vein-ends. 

 Under surface similar. W. China: Mou-pin, Wa-Shan and H^iang-Mu-Chang. 



12. Genus: Oypsochroa Hb 



•n. 



Palpus rather short and slender. Antenna rather long, in both sexes finely ciliated. Legs long and 

 slender, hindtibia without median spurs, the terminal ones very short. Abdomen slender. Wings rather narrow, 

 with smooth, glossy scaling. Forewing with cell rather long, second subcostal wanting, first subcostal anasto- 

 mosing twice. Hindwing with costal closely approximated to cell to one-half, second subcostal not stalked. Only 

 one species known. Possibly related to Orthostixis, although the ^J genitalia do not show any sign of affinity. 



renilidaia. G. renitidata Hb7i. (1 c). Wings as well as face, antenna, etc., uniformly white, only the underside of 



forewing slightly smoky. Early stages apparently unknown. The moth is local, occuring from S. E. Russia 

 to Asia Minor, and little seems to be recorded as to its habits. It has been taken locally also in Ardeche, 

 South-east France. The life-history has recently been made known by Chretibk. The eggs are laid in rows 

 of 2 — 6 on the leaves of Linaria striata, and are yellowish white, with rows of small oval depressions. The 

 larva hatches in 10 — 12 days. It is sub-cylindrical, the segmental incisions deep, the colour bluish white with 

 brown latero-dorsal band, tubercles and setae small ; but is chiefly remarkable for the possession of two addi- 

 tional pairs of rudimentary prolegs on the 4. and 5. abdominal segments, which, however, become still more 

 minute in the adult larva. Pupa slender, whitish, with darker head, brown dorsal line and yellowish wing- 

 cases, the extremities of which are free, reaching as far as the 7. or 8. abdominal segment; in a cocoon on 

 the foodplant, resembling in texture that of Nola. That of the summer generation produces the imago in 

 about a fortnight but the autumn pupae hibernate. The moth appears in May and June and again in July 

 to August, and rests among the Linaria, folding the wings closely around the twigs. 



13. Genus: Orthostixis Hbn. 



Characters somewhat as in the preceding genus, but antenna and legs shorter, wings much broader, fore- 

 wing with all veins present, first subcostal arising from costal, second to third stalked, their stalk anastomosing 

 with first and usually with fourth, hindwing with costal further from subcostal, in cribraria connected with it 

 by a bar near the base. Geographical range somewhat limited, the only two known species being almost confined 

 to the Balkan Peninsula, Asia Minor and Transcaucasia. The larva of one of the species has been made known 

 within the present century, and is briefly described below. 



cribraria. 0. cribraria Hbn. (= laetata F.) (Id). White, the forewing with two, the hindwing with one row of 



black dots on the veins representing the lines. Both wings with black cell-spot and series of intraneural dots 

 on the distal margin. Underside similar, the proximal series of dots obsolete. — Larva dorsally dirty green, 

 marked with yellow subdorsal line, yellow lateral protuberances, ventral surface mainly yellow; tubercles black, 

 distinct, bearing long whitish bristly hairs. Pupa at the head light broAvnish, otherwise bone-white with black 

 markings and some yellow spots. The moth is double-brooded (May and August) and occurs from S. E. Europe 

 to Armenia. 



cakidnria. 0. calcularia Led. (Id). Similar to the preceding, somewhat larger, but at once distinguished by the 



more oblique course of the proximal series of black spots and by the dark smoky underside of the forewing. 

 The spots, moreover, show a tendency to be enlarged into dashes, and structurally the present species differs 

 in the obsolescence or entire absence of the bar between costal and subcostal of hindwing. Known only from 

 northern Asia Minor and Transcaucasia. 



14. Genus: Centrouaxa Prout. 



Nearly related to Orthostixis, but with the palpus more minute, the antenna bipectinate in both sexes, 

 the branches moderate or long in the ^, shorter in the $, wings more thinly scaled, less pure white, radials 

 of forewing strongly curved, hindwing with costal more nearly approximated to cell near base, second discocellu- 

 lar rather oblique, third nearly vertical, the bend at origin of second radial being therefore distad instead of 

 proximad. The early stages are still unknown. The name-tj^e of the genus, orthostigialis Warr., inhabits 

 North India, but the others all belong to central and western China. All are closely related. 



