of the Australian Lamellicorn Genus Crt/ptodus. 3 



The small rounded head, the very convex prothorax and elytra, 

 and the chesnut colour, at once distinguish the insects which I 

 have received from Adelaide, and regard as belonging to this 

 species of Germar, from the preceding insect with which they 

 agree in their 9-jointed antennae, and in having the base of the 

 mentum bituberculated ('* mentura latum confertira punctatum, 

 basi emarginatum," is Germar's description of this organ) ; the 

 basal joint of the antennae is gradually dilated to the apex, which 

 has the outer angle rounded. Tlie sides of the prothorax are 

 rounded, but the base is considerably wider than the anterior part 

 (contrary to the description of Germar — " basi et apice fere aequa- 

 liter angustatis.") The suture and three costae on each elytron 

 are slightly elevated, each being margined with a slight sulcation, 

 in which is a row of punctures, the interstices being also subsul- 

 cated with rows of irregular punctures, nearly agreeing in size 

 with those of the sulci at the sides of the costae. This character 

 disagrees with Germar's description — "elytrorum punctis grossis 

 seriatim digestis, approximatis, interstitiis in dorso convexius- 

 culis subtiliter et remote seriatim punctatis." Notwithstanding 

 this disagreement, I consider my Adelaide specimens to be iden- 

 tical with Germar's C. piceus ; but should future discoveries prove 

 them to be distinct, the specific name C. convexicollis would well 

 indicate the insect represented in Plate I. fig. 2. 



One specimen received from Adelaide is about two-thirds of 

 a line longer than that figured in Plate I. ; it is also somewhat 

 more glossy and convex, with stronger punctures on the prothorax 

 and elytra ; the latter with the three costae on the elytra not so well 

 defined ; the abdomen beneath without impressed lines, and the 

 sides of the prothorax narrowed from the middle to the hind 

 angles, making this part of the body more rounded, and thus more 

 nearly agreeing with Germar's description. 



Section B. Antennae 10-articulatae. Ungues pedum anticorum in 

 mare inaequales, uno intus bifido. 

 a. Prothorax antice baud tuberculo armatus. Elytra parum 

 aut vix sulcata. (Subgenus, Cryptodinus, Westw ) 



Sp. 4. Cryptodus Tasmannianus, Westw. (PI. I. fig. 3.) 

 Subdepressus, niger, nitidus, punctatus, capite obsoletius bitu- 

 berculato ; elytris obsolete tricostatis sparsius varioloso- 

 punctatis, mento basi truncato, articulo basali antennarum 

 angusto. 



b2 



