196 Prof. J. C. Schjodte on the Classification of Cerambyces, 



also observed in the group Lamiini [Diastocera, Ceroplesis) ; but 

 in all those short, clumsy, partially apterous forms living in sand- 

 dunes, steppes, and deserts, which are allied to our Lamia textor, 

 the hairs of the pores are, as in this species, collected in de- 

 pressed spots, as, for instance, in Zographus, Penthea, Dorca- 

 inorphus, Monilema, Phrissoma, Dorcadion, and Parmena. The 

 silky, alternately dark and light covering of the antennae of 

 many Cerambyces is also to be taken into consideration ; but for 

 this the microscope is indispensable ; and the different forms 

 are not so sharply distinguished as to be of use for classifica- 

 tion. 



For the definition of genera and species I have made use of 

 several other peculiarities which have not hitherto been taken 

 into proper consideration, but which require no further explana- 

 tion here. 



I propose the name of " flying-hairs '' {pili volatiles) for the 

 peculiar, long, soft hairs, pointing out from the body, which are 

 found on the antennae and limbs, sometimes even all over the 

 body, of certain Cerambyces. I consider it probable that their 

 object is to facilitate the flight by giving the animal greater 

 circumference without increasing its weight in the same degree 

 — a view which is confirmed by the circumstance that these hairs 

 only appear in such genera and species as by their structure 

 in other respects seem less adapted for enduring flight. It is 

 possible, however, that in several cases the rows of hairs found 

 on the antennae have a different object. 



IV. 



In Callichroma moschata the metasternum is unusually large, 

 and shows in each of its posterior angles a small, narrow, spout- 

 shaped slit. Through these apertures a liquid secretion finds 

 its way out, which causes the peculiar strong smell of this 

 Cerambyx, The secretion is produced by a pair of large, flat, 

 bilobate glands containing heaps of glandular cells, the ducts 

 from all the cells of each heap being collected into a bundle. 

 Similar apertures are observed on the metasternum of all the 

 numerous and splendid exotic species of Callichromaj both from 

 the Old and the New World, and besides in a series of genera 

 from India and South Africa, particularly Pachyteriaj Litopts, 

 PromeceSj and Polyzonus. These musk-beetles form a small 

 natural subgroup of their own, united also by other charac- 

 teristic features, and easily distinguishable by the apertures in 

 question. 



The following remarks contain what I have besides to com- 

 municate concerning the internal anatomy. It contains the 

 results of numerous dissections of my own at an earlier period, 



