Entomological Society. 455 



Rh. cribrarius, W. Piceo-niger prothorace rude punctato, excava- 

 iioneprofundd in parte medid et anticd, utrinque tuber cutis duobus 

 elevatis armato, elytris irregulariter punctatis. Long. corp. lin. 

 10. [Hub. Senegal ? 



Actinobolus, W. Corpus oblong 'o-ovatum convexum. Clypeus an- 

 tide in lobos 5 rotundatos productus. Antenna articulol" 10 lato. Os 

 inferum mento magno obtectum. Labrum transversum. Labium et 

 palpi labiates (nisi apex articuli ultimi) mento obtecta. Mandi- 

 bular cornea, curvata apice acuta. 



Act. radians, W. Piceo-rufus antennis tarsisque nigricantibus, ca~ 

 pite postice et prothorace antice varioloso -punctatis, hoc lined dor- 

 sali impresso, elytris striato-punctatis. Long. corp. lin. 9. [Hab. 

 Brazil. 



A review of the characters of the Phileurideous Dynastida in 

 comparison with those of Cryptodus and the two groups above de- 

 scribed, was then made, and a description was added of a genus 

 *.' which possesses a structure of the organs of the mouth quite unlike 

 that of every other Dynastideous group ;" namely, 



Leptognathus, W. Corpus oblong o-ovatum convexum. Clypeus 

 (os omnino obtegens) antice in lobos duos rotundatos elevato-pro- 

 ductus. Os inferum minutum mento magno clausum. Mandibular 

 minutce bipartite (fere ut in Cetoniis). Maxilla lobis duobus 

 minutissimis membranaceis (super o vet galea vix distinguendo) . 

 Prothorax magnus, $ antice subquadratus impressione magnd trans- 

 versd notatus. 



Leptognathus Latreillianus, W. Piceo-niger, nitidus, prothorace 

 rude punctato postice sulco impresso, elytris rude punctato-striatis 

 striisante apicem confluentibus . Long. corp. lin. 8-10. [Hab 

 Senegal. 



September 6th. — W. W. Saunders, Esq., F.L.S., President, in 

 the Chair. 



The President read an extract from a letter received from S. S. 

 Saunders, Esq., in Albania, giving an account of some experiments 

 made with Mygale Ionica, whence it appeared that the peculiarity 

 previously observed and described by him in his memoir on that 

 insect, consisting of the formation of a trap door at each end of its 

 tube, was only an accidental circumstance. 



Mr. Tulk exhibited a specimen of Tachina pacta, Meig., together 

 with the abdomen of Carabus violaceus : the former insect had been 

 reared from one of four pupse found in the interior of the abdo- 

 men of the latter. The Carabus was found dead amongst moss on 

 the 16th August, 1841, and the first imago appeared on the 21st, 

 the second on the 23rd, the other two still remained undeveloped. 

 These four pupae almost entirely filled up the cavity of the abdomen. 

 An oval aperture existed in the margin of the third ventral arc of 

 the abdomen, near the margin of the elytra, and was probably that 

 by which the larvae made their way into the interior, after having 

 been hatched from eggs deposited on the exterior of the living beetle. 



He also exhibited some specimens of Pediculus Melitta, K., found 



