792 



Chry&omela, Linnaeus). The Clavipalpes of Latreille 

 seem more naturally to be allied to some of the f'un- 

 givorous Necrophagous pentamera. 



TETRAMERIQM (Gaertner). A genus of West 

 India evergreen shrubs, belonging to the fourth class 

 of Linnaeus, and to the natural order Rubiacetz. The 

 genus is nearly allied to Coffea, and was so called by 

 Linnaeus and Aublet. In our stoves the species are 

 grown in "sandy loam and moor-earth, and may be 

 increased by cuttings. 



TETRA'NTHERA (Jacquin). A genus of ever- 

 green shrubs and trees, natives of Australia, India, 

 and Mexico, separated from the genus Litzea of Lam- 

 bert and others. The flowers are enneandrous, and 

 the genus ranges among the LaurincE. The species 

 require the ordinary stove treatment as well in growth 

 as in propagation. 



TETRATOMA (Herbst). A genus of coleop- 

 terous insects, belonging, according to Latreille, to 

 the section Heteromera and family Diaperidce, distin- 

 guished by having the body of an oblong-ovate form, 

 with the tibiae narrowed and without spines, the 

 antennae as long as the head and thorax, and termi- 

 nated by a four-jointed club ; the two posterior tarsi 

 have onlv four joints, nevertheless it appears to us that 

 this genus much more nearly approaches some of the 

 Necrophaga, or rather fungivorous beetles, and espe- 

 cially to the genus Mycetophagus. The dissections 

 of these two genera, given by Mr. Curtis in his Bri- 

 tish Entomology, fully confirm this relation. There 

 are two British species of small size, T. fungorum 

 being the type. They are found in fungi, and under 

 the bark of trees. 



TETRIX, (Latreille) ; ACRYDIUM, (Leach). A 

 genus of small but curious orthopterous insects, be- 

 longing to the family of the locusts (Locustulce), dis- 

 tinguished by having the hinder part of the head 

 received beneath in a produced part of the proster- 

 num, forming a kind of cravat; the lower lip is divided 

 into four lobes, the tarsi have no pulvilli, the antennas 

 have only thirteen or fourteen joints, and the upper 

 side of the prothorax is prolonged behind in the 

 shape of a large scutellum, entirely covering, and 

 occasionally extending considerably beyond, the ex- 

 tremity of the body ; the elytra are minute, but the 

 wings are large and folded up like a fan ; the species 

 are very small and obscurely coloured; they frequent 

 warm grassy banks, and are occasionally very plen- 

 tiful in such situations, as for instance, in one part of 

 Battersea Fields, well known to collectors under the 

 name of the " Acrydium Bank." The type is the 

 Acrydium subiilatum, Fabricius. 



Tripctalocera ferruginea, figured in our plate OR- 

 THOPTEROUS INSECTS, from Malabar, and described 

 in the Zoological Journal, No. 20, is distinguished 

 by the curious structure of the antennae, which have 

 only six joints, and by the compressed keel upon 

 the back. 



TETTIGONIA. A generic name employed in 

 entomology for several very distinct groups of 

 homopterous insects. Fabricius, followed by the 

 German writers, gave this name to the musical cicadae. 

 Stephens and Curtis employ it for the frog-hopper 

 (Aphrophora spumaria of Germar), whilst Latreille 

 gives it to another group, having the head, when seen 

 from above, of a triangular form, without being very 

 much elongated or flattened, the eyes not incised 

 by the margins of the head, and the ocelli situated 

 between them, or laterally. In this confusion of 



TETRAMERIUM THE A. 



nomenclature (entirely resulting from the non-adoption 

 of some fixed principle regulating the employment of 

 long-established generic names, when it has been 

 thought necessary to subdivide an old genus) it 

 would perhaps be most advisable entirely to abandon 

 the old name Tettigonia, and to give to the musical 

 Cicada, or the Fabrician Tettigon'ue, the generic name 

 of Cicada (as has already been done in the course of 

 this work), to give to the frog-hopper the name ot 

 Aphrophora (see the article CERCOPID^E), and to call 

 the Latreillian Tettigonia by the generic name of 

 Cicadella. 



TETYRA, (Fabricius) ; SCUTELLERA, (Lamarck), 

 which see. 



TEUCRIUM (Linnaeus). A numerous genus of 

 shrubs, under-shrubs, and herbs, the latter both 

 annuals and perennials, the whole divided into six 

 sections. The flowers are didynamous, and of course 

 rank among the Labiate. Some of the species are 

 ornamental and admitted into our hardy and green- 

 house collections, and are all easy of propagation by 

 seeds or cuttings. The English name is Germandia. 



THALICTRUM (Linnaeus). A genus of her- 

 baceous perennials, mostly European, known in 

 English lists as meadow rue. The flowers are poly- 

 androus, and belong to Ranunculacece. They grow 

 well in any soil in the open borders, and are easily 

 increased by division. 



THANASIMUS (Latreille). A genus of cole- 

 opterous insects, belonging to the family Clej-idce, 

 having the antennae gradually thickened, the maxillary 

 palpi filiform, and the labial palpi securiform. The 

 species are of moderate size, and from the peculiar 

 character of their appearance and colours have ob- 

 tained the specific names of Formicarius, Mutillarius, 

 &c., from their resemblance to ants, Mutillce, &c. 

 One species is found in this country, T. formicarius, 

 which is occasionally met with in considerable num- 

 bers under the bark of old stumps, where it is pro- 

 bable that its larvae feed upon the larvae of the 

 wood-boring Anobia, which frequent the same situ- 

 ations. 



THAPSIA (Linnaeus). An umbelliferous genus 

 of European perennial herbs, formerly called Laser- 

 pitium by Desfontaines, and easily increased in the 

 open border by seed. 



THEA (Linnaeus). This is the celebrated and 

 useful Chinese tea plant. The flowers are monadel- 

 phous, and being nearly allied, are stationed among 

 the Camelliacece. We have had two species (or va- 

 rieties) of this valuable plant in our collections for 

 nearly seventy years ; but notwithstanding the long 

 and constant intercourse our merchants have had 

 with the Chinese empire since 1768, it is still uncer- 

 tain whether the green and bohea sorts we have in 

 our gardens be or be not the true plants whence the 

 manufactured commodity is obtained ; for it is quite 

 feasible to suppose that the tea-plant, so long and so 

 extensively domesticated in that country, must have 

 broken into many varieties, and the one producing 

 the greatest number of leaves, and being at the same 

 time of most moderate growth, would be preferred to 

 varieties of more exuberant character. However this 

 may be, a plantation of tea, seen in the neighbour- 

 hood of the city of Canton, appeared to be neither the 

 green nor bohea of our gardens, but an intermediate 

 sort. It is quite certain that the different descriptions 

 of the manufactured article, both in the Chinese and 

 home markets, arise entirely from the time of gather- 



