88 



spring of evolutionary progress. Thus, for instance, the species which I have called 

 T. minor, found by Mr. Champion in Guatemala, bears bo strong a resemblance to 



the European T. grandicollis that it might be considered a local form of that 

 Bpecies, the difference between tbem consisting in the much smaller size of 

 T. miliar, and in the Bhape and sculpture of its thorax; if, however, climatic or 

 other influences had in this case led to metamorphosis, their effect would have 

 produced similar results through the whole rait-: but, in contradiction to such a 

 theory, 'J', grandicollis, agreeing in every respect with the European type, was also 

 taken by Mr. Champion in the same region as '/'. minor; to separate the two, 

 therefore, seems the only way to avoid confusion. Instances of a similar land 

 have also occurred with other Bpecies of Trichopteryx, and notably in the case of 

 '/'. atomaria, of which the original type form is found in almost every region 

 together with allied species. 



The species of Trichopteryx are probably more numerous than those of any 

 other genus of Coleoptera, and owing to their minute size the difficulty of distin- 

 guishing them from each other is so great, that an incipient student feels often 

 inclined to give them up in despair. And, since it is sometimes impossible 

 to arrive at a satisfactory determination without actual comparison, collectors 

 should always hear this fact in mind — they should collect plentifully whenever an 

 opportunity occurs, and distribute authentic types with the utmost liberality. 



Owing to the multitude of species now contained in this genus, no synoptic 

 tabulation would prove of any use. I have, therefore, in the following pages, given 

 a separate and full list of every species which has hitherto been found in each 

 principal division of the world ; and have added to every species a few of its 

 leading diagnostic characters. 



SPECIERUM OMNI I'M EPITOMA, 



iiEGIONIUUS PKOPRIIS SEGREGATAKUM. 



species i.i •i;t)i , .i:.K. 



ELYTBIS la FESCEN 1 mi B. 



L. c. 1 mm. — Brevis, lata, valde convexa, nitida, minutissime tubercu- 

 Iata, pronoto valde dilatato, ad basim latissimo, angulis valde pro- 

 duces, elytris attcnuatis, ped. atque ant. flavis .... Sara. 



L. c. 0'90 mm. — Oblonga, valde convexa, nitidissima, modice et remote 

 tuberculata, pronoto ad basim latissimo, angulis latis, valde 

 productis, elytris par am attcnuatis, ped. atque ant. rufescentibus Hellenica. 



L. c. O80 mm. — Oblonga, subparallela, modice tuberculata, pronoto ad 

 basim latissimo. angulis parum productis, elytris oblongis, ped. 

 atque ant. longis, flavis ........ Guerinii. 



L. c. O'HO inni. — Oblonga, elongata, sat fortiter tuberculata, pronoto ad 

 basim latissimo, angulis vix productis, elytris brevibns, ped. atque 

 ant. brevibus, flavis ......... obscsena. 



L. c. 0-75 mm. — Ovata, subelongata, fortiter tuberculata, pronoto ante 

 basim latissimo, angulis parum productis, elytris ovalibus, 

 abdomine rufescenti, ped. atque ant. lsete flavis . . . . acuminata. 



L. o. O'GO mm. — Oblonga, brevis, modice tuberculata. pronoto subquad- 

 rato, angulis vix productis, elytris brevibus, quadratis, abdomine 

 nigro, ped. atque ant. Late Bavifi elevata. 



L. c. 0-aa mm. — Oblonga, subparallela, depreesa, minute et distincte 

 tuberculata, pronoto quadruto, angulis parum productis, elytris 

 brevibus, quadratis, abdomine fusco, ped. atque ant. flavis . . Waterhousii. 



