3092 Zoological Society. 



them to constitute but a single species, the chief of which are, that both are taken in 

 equal abundance in the same localities and at the same season ; that the individuals 

 of maculicollis are invariably male, and those of fulvipennis invariably female (col- 

 lectors, moreover, have asserted them to be sexes of one species), and that the struc- 

 ture of the wings and legs is absolutely identical; he considers the extraordinary 

 antennae of maculicollis to be sexual only, since a similar discrepancy exists in other 

 longicorn genera, and also in several other orders of Coleoptera : the discrepancy in 

 colour he considers of little moment, although extremely interesting when carried to 

 such an excess : he proposes to retain the name of Distichocera maculicollis, although 

 the genus and species are named from characters possessed by one sex only. The 

 author next proceeds to describe two unique individuals of opposite sexes, which he 

 thus associates under the name of 



DlSTICHOCEEA KlEBII. 



Mas. — Caput nigrum, longitudinaliter sulcatum ; antennae dimidio corporis lon- 

 giores, ll-articulatae, articulis 3 — 10 biramosis, llo sesquialtero : prothorax 

 niger, vittis 2 latis fulvis, dorso inaequalis, lateribus medio 1-dentatus : scutel- 

 lum nigrum : elvtra fulva, 5-carinata, apice dehiscentia, singulo truncato, 

 truncatura bisinuata: pedes nigri, metatibiis bicalcaratis. (Corp. long. 1*15 

 unc. Elytrorum lat. max. *3 unc.) 



Fern. — Caput nigrum longitudinaliter sulcatum ; antennae dimidio corporis vix 

 longiores, ll-articulatae articulis 4 — 8 apice emarginatis : prothorax niger, 

 vittis 2 latis fulvis, lateribus medio 1-dentatus : scutellum nigrum lateribus 

 fulvum : elytra fulva, 5-carinata, apice dehiscentia, singulo truncato, trunca- 

 tura bisinuata: pedes nigri, metatibiis bicalcaratis. (Corp. long. 1*25 unc. 

 Elytrorum lat. max. '375 unc.) 



Both the specimens are described at greater length in English, and the points in 

 which they agree are pointed out ; while the only important discrepancy in structure, 

 that of the antennae, is regarded, as in the previous species, that of sex only. A third 

 species is founded on a unique and mutilated female specimen, which is referred to 

 the present genus from the general structure, the antennae being entirely wanting, 

 and the colour much deadened by long immersion in spirits, it is named 



Distichocera MacLeayi. 



Fern. — Caput nigrum, fronte ferruginea longitudinaliter sulcata, antennae desunt : 

 prothorax ferrugineo-lanuginosus, lateribus tuberculatus, haud dentatus : scu- 

 tellum ferrugineo-lanuginosum,marginibus nigrum, glab rum : elytra ferruginea, 

 5-carinata, apice vix truncate vix dehiscentia : pedes nigri, metatibiis bicalca- 

 ratis. (Corp. long. 1-4 unc. Elytrorum lat. max. '5 unc.) 



The new species are dedicated to Messrs. Kirby and MacLeay, whose talents and 

 researches had supplied us with all our previous knowledge of the genus. 



Mr. Adams communicated descriptions of several new species of Emarginula from 

 specimens in the collection of Mr. Cuming. — I). W. ]\f. 



