1873.] MR. \V. S. ATKINSON ON A NEW BUTTERFLY. 5/1 



wings elongate, the basal half very narrow, inner margin concave 

 beyond the extremity of the abdomen, outer margin prominently 

 convex, scalloped, and tailed. The precostal nervure branched, 

 nearly as in Eurycus. Legs of moderate length ; anterior tibiae 

 with a stout spine near the middle ; tarsi slender, the first joint 

 very long; claws simple, of unequal length. 



Abdomen slender, extending to less than half the length of the 

 posterior wings. 



This genus is in some respects intermediate between the Mediter- 

 ranean genus Thais and the Chiuese Sericinus. 



Bhutanitis lidderdalii, n. sp. (Plate L.) 



Body and all the wings fuliginous black, with irregular white 

 markings. Posterior wings three-tailed. 



Anterior wings above with the cell crossed by four slender white 

 bars at equal distances, and with a fifth similar bar beyond the ex- 

 tremity of the cell ; the first and second bars continued in wavy 

 scalloped lines to the interior margin, the third and fourth with 

 white loops attached to their extremities below the nervure of the 

 cell; a submargiual scalloped line from before the apex to the 

 rounded posterior angle, within which are two somewhat suffused 

 and deeply scalloped and irregular lines from the costal to the in- 

 terior margin. 



Posterior wings with the upper and outer portion marked with a 

 network of white lines, the lower anal portion occupied by a large 

 coloured patch, of which the upper part is bright crimson-red, and 

 the lower rich orange, composed of three submargiual lunules, of 

 which the interior is the largest and the exterior the smallest ; the 

 space between the red and orange occupied by a broad, transverse, 

 deeply black belt, extending from the third median nervule to the 

 anal angle, containing two large blind ocelli surmounted by white 

 lunules, the first at the anal angle and the second between the first 

 and second median nervules, together with a trace of a third ocellus 

 between the second and third median nervules. The three median 

 nervules extended into linear tails, of which the outermost is the 

 longest (^j- of an inch), and the innermost the shortest (about ^ of 

 an inch). 



The underside of all the wings marked as above, but with the 

 white lines broader, the orange lunules of a lighter colour, and the 

 crimson-red replaced by light pink. 



The abdomen barred and streaked longitudinally with yellowish- 

 white lines ; anal extremity yellow. 



Expanse of wings 4| inches. 



This fine insect was first discovered in May 1868, near Buxa, in 

 the Bhutan Himalayas, at an elevation of 5000 feet, by Dr. R. 

 Lidderdale, of the Bengal army. Dr. Lidderdale obtained two fresh 

 specimens from the same locality in 1872; and from one of these, 

 kindly communicated to me, the foregoing description and the ac- 

 companying drawing have been prepared. 



I am glad to associate Dr. Lidderdale' s name with his very in- 



