Lonyicornia Malayana. 95 



fined to Asia and Africa, witii tlie exception of three European 

 species of Mesosa* (one of which occurs in England). None 

 have hitherto been detected in Australia.-}- Of the twenty-one 

 genera included in the Wallacean Collection, ten also occur on 

 the mainland of Asia, and besides these a few more have been 

 very recently described by M. Thomson, principally derived 

 from the extensive collections made by the Comte de Castelnau 

 in Malacca. Three species are known to me from North China, 

 but from the English possessions in India I have never seen a 

 specimen ; that country is, however, nearly a terra incognita to 

 the entomologist. 



The head in the Mesosincs is always more or less quadrate, the 

 front generally ample, never spreading out below the eyes, the 

 antennary tubers small, and, with one or two exceptions, widely 

 apart ; the eyes small or only of moderate size, and deeply and 

 widely emarginate ; the antennae are more or less slender, but the 

 scape is always long and cylindrical or occasionally slightly clavi- 

 form, produced and having a scar-like section at the apex ; many 

 of the genera have their antennae more or less pilose, or tufted. 

 The prothorax is even, rarely irregular, a few genera only having 

 a short tooth at the side. J In the majority of the species the 

 elytra are also perfectly even, but in some there is a tendency to 

 the production of elevated lines, and in one genus of basal crests 

 (^Msopida). The legs are, on the whole, of moderate length, the 

 anterior being almost invariably the longest, especially in the 

 males; the femora are stout, thickest in the middle, not clavate, 

 the tibiae are always considerably longer than their tarsi ; the tarsi 

 are short, of equal size, except that the anterior are sometimes 

 dilated, the three basal joints together not often exceeding tlie 

 claw-joint in length. The anterior coxae are large and globose, 

 never armed, and their acetabula are narrowly angulated ex- 

 ternally ; the prosternum is generally raised to a level with the 

 coxae; the mesosternum is also elevated with few exceptions, and 

 often produced or toothed anteriorly. 



The number of species in the collection is upwards of sixty, § 

 distributed into the twenty-one genera tabulated below. 



• Dr. Leconte, however, describes a Me$osa from California. This forms the 

 genus Synaphe, of M. James rhomson. 



f The genus Metmi, placed in this sub-family by M.Thomson, is, from its 

 short scape, approximate antennary tubers, and longer and unequal tarsi, rather, 

 I think, to be referred to the MonochamiucB. 



% In Agelasta, a very natural genus, some of the species have a very decided 

 lateral tooth, in the majority there is no trace of it whatever. 



§ In the genus Cacia we have three or four forms, of which it is extremely 

 difficult to say whether they should be treated as species or as varieties. 



