600 MR. H. H. DRUCE ON NEOTROPICAL [June 18, 



owing to the diflferent appearance of the female on the under side. 

 There is, however, in Mr. Godman's collection a female from 

 Obydos, Amazons, which is identical with the form found in 

 Guiana and figured by Stoll. 



I have examined a considerable number of males from Surinam 

 and Cayenne, and find that they always have three or four 

 separated blue spots on the hind wing below as shown in Cramer's 

 figure, pi. 163. E. These spots are always absent in specimens 

 from Colombia, Brazil, and the Amazon regions. 



There is a small race of males of both forms as regards the 

 under side, in which the blue of the upper surface has almost 

 entirely disappeared, leaving the wings brown like the female. 

 We have several such specimens from Surinam, whence there is 

 also one in the British Museum, whilst Mr. Godman has some from 

 Tapajos and Ega. 



Thecla collustra, sp. n. (Plate XXXY. fig. 15.) 



Male. Upper side uniform dark grey with purple reflections. 

 Abdominal half of hind wing dull indigo-blue which, when held at 

 an angle, appears shining. Lobe small, with a central orange spot 

 almost surrounded by white. Cilia and abdominal fold pale grey. 

 Under side : ground-colour pale grey. Fore wing : an ultramedian 

 linear white band inwardly bordered with yellow and a submar- 

 ginal dark line. Hind wing : an ultramedian, linear, white line 

 commencing on the costa and reaching, much-angled, to the anal 

 margin, inwardly bordered with a black line and again with a 

 bright yellow line. A large orange marginal patch occupying 

 the space between the lower median nervules and beyond, paler 

 inwardly and supporting on its outer edge a small, distinct, 

 triangular black spot. Lobe black, crowned with white and again 

 by an elongate orange patch. Space between the lobe and tail 

 dusted with black and white scales. An anteciliary black line 

 inwardly bordered with white. Cilia of fore wing bi-ownish, of 

 hind wing grey. Tails black tipped with white. Abdomen dark 

 above, pale below. 



Expanse 1 inch. 



Hah. Caparo, W. Cent. Trinidad {F. Birch). 



Type, Mus. Druce. 



On the luider side this insect is much like T. leomcria Hew.*, 

 but on the upper side is quite diflferent The outer mai'gin of 

 the fore wing is somewhat convex, and I had thought that it 

 might be the female of that species, which is undescribed. But 

 a close examination has convinced me that I had before me the 

 male of another species which does not appear to be described. 

 The terminal joint of the palpi is comparatively shoi^t as is usual 

 in males. 



Mr. Godman has two males of T. lemuria, including the type. 



* Thecla lemuria Hew. Descr. of Thecla, p. 10. 



