50 



MR. W. C. HEWITSON ON NEW BUTTERFLIES. [Feb. 12, 



Total length 1" 



Length of tail 



of head 



Distance of eyes 



Breadth of head behind . . 



Greatest breadth of body . . 

 The largest specimen contained in its stomach three species of 

 lizards, viz. Phrynocephalus helioscopus, Pallas, Eremias velox, Pall., 

 juv. (vittata, Eversmann), and Eremias variabilis. Pall. 



Conclusions. — 1. Chorisodon sihiricum, Dum. & Bibr., does not 

 come from Siberia properly so called, but from the sandy deserts of 

 Central Asia, around Lake Aral and the Caspian Sea. 



2. The row of unfurrowed maxillary teeth is not interrupted by a 

 diastema. 



3 . Chorisodon is closely allied to Coelopeltis ; it would therefore 

 be most unnatural to separate them into two different families. 



4. The name Chorisodon sibiricum (date 1854) must be rejected, 

 as it applies to the same species which had been named in 1 83 7, by 

 Brandt, Taphrometopon lineolatum. 



EXPLANATION OF FIGURES. 



Figs. 1-3. Head, viewed from different sides. Nat. size. — Fig. 4. Anal region. 

 Nat. size. — Fig. 5. Maxillary, palatinal, and pterygoidal bones, with the teeth, 

 from the right side. Twice magnified. 



3. Descriptions of some Butterflies from the collection 

 OF Mr. Wallace. By W. C. Hewitson. 



(Plates Vin., IX.) 

 Diadema divona. (PI. VIIL fig. 1.) 



Alis omnibus nigris, duplice serie submarginali mncidarum flavi- 



darum, anticis ante medium fascia lata macularum ohlonga- 



rum serieque macularum Jlamdarum, posticis basi ad medium 



flavidis, renis nigris. 



Upperside, male : dark brown, rufous towards the anal angle of 



the posterior wing. Anterior wing with numerous bands and spots 



