portion of poplar-twig was less than an inch in length, and on it were nearly 

 one hundred of these empty skins. 



Mr. Herbert Druce exhibited a large selection of Rhopalocera from Costa 

 Rica, being part of a collection formed in that country by Dr. Van Patten. 

 In all there were probably nearly fifty new species in the collection, 

 including four of Papilio, three of Morpho, three or four of Leptalis, a new 

 genus of Satyridse allied to Pronophila, &c., &c. These are in course of 

 description by Mr. Butler, in ' Cistula Entomologica.' 



Prof. Westwood exhibited specimens and drawings of various species of 

 Acaridse and other aberrant Arachuida, either entirely new to Science or 

 not previously observed in this country, as follows : — 



1. Fam. Trogulidfe. A small species of the genus Trogulus, differing 

 from any of those figured by Koch, captured by the Rev. 0. P. Cambridge 

 in moss at Bloxworth, Dorsetshire ; described by Prof. Westwood as 

 T. rufitarsis. 



2. Genus Stylocellus, Westwood. A new genus pertaining to the recently 

 instituted family Cyphophthalmidse (Joseph, in Berl. Ent. Zeit., vol. xiii.), 

 founded upon a species (S. sumatrauus, Westiv.) from Sumatra, forwarded 

 by M. Snellen van Vollenhoven as a new species of Trogulus. Differing from 

 Cyphophthalmus (the type of which is a minute species from the caves of 

 Carniola) in having the chelicerae shorter than the palpi, and with the terminal 

 dactyls of the former simple and very acute, and the cephalothorax without a 

 deeply incised emarginate mark, each side being produced into a short obtuse 

 horn. Long. 7i mm. A second species (S. javanus, Westiv.) is in the 

 Collection of the British Museum. 



3. Argas reflexus, Latrellle. Type of a family and genus not hitherto 

 recorded as British, A colony of this species had been found by Mr. Gulliver 

 under a stone in the crypt of Canterbury Cathedral. It ordinarily infests 

 pigeons on the Continent, and the colony had probably originated from 

 individuals that had fallen from the flocks of those birds frequenting the 

 Cathedral. (Mr. F. Smith added that specimens of the dog-tick had been 

 forwarded to him that had been found in the same Cathedral, and he has 

 since furnished information to the effect that the British Museum possesses 

 an example of the Argas from the same building.) 



4. Argas noctulse, Westw. Perfectly round in outline, the disc of the 

 cephalothorax with deep and large punctures widely scattered, and with 

 radiating punctures towards the margins. Long. 5 mm. Taken from off 

 a gentleman in the church of Whittlesford, Cambridgeshire, having evidently 

 fallen from the larger noctule bat, of which two young individuals had 

 dropped close to the gentleman on whom it had been found, and whom it 

 attempted to bite. Forwarded to Prof. Westwood by Mr. F. Bond. It is 

 closely allied to the Argas pipistrellse of Audouiu, but is very much 

 larger. 



