4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



1878. ElCHHOFF, W.(ll). 



In the Tomicini, Eichhoff placed the Genus Gnathotrkhus in his 

 Section II, Xylophagi, subfamily Xyleboridac. The revised de- 

 scription of the genus as it was given on page 405 is: 



Mentum oblongum, versus basin fortiter angustatum, post medium lateribus 

 profunda sinuatum, et iterum versus apicem subdilatatum, apice rotundato; 

 ligula linearis longa post medium menti inserta, versus apicem subdilatata, 

 apice emarginata, angulis utrinque pilis longis munita. Palpi labiales valde 

 elongati, articulis i et 2 longis, aequalibus, 3° parvo. Maxillae mala lata 

 rotundata, pilis subtilibus longis intus ciliata, apice toto setis densissimis 

 coactis cincta. Palpi maxillares articulis magnitudine gradatim decrescenti- 

 bus, ultimo striis longitudinalibus obscuris notata. Antennae funiculo 5-ar- 

 ticulato, articulo hujus 1° crassiusculo, bulbiformi, scquentibus niulto mi- 

 noribus, transversis, crassitie crescentibus ; capitulo subgloboso, toto corneo, 

 3-articuIato. Prosternum processu vix ullo. Episterna metathoracis a mar- 

 gine sinuato elytorum plane obtecta. Tibia lineares, extus remote denti- 

 culatae, apice truncatac. Tarsi baud recepti, articulis i, 2, 3 aequalibus. 



1883. Leconte, J. L., and Horn, H. G.(i3). 

 The authors placed Giiathotriclius Eichhoff in their key to the 

 genera in the subfamily Scolytinae, the Tribe Tomicini and Group 

 Corthyli. In the group it was separated from Corthylus and 

 Monartlintin by its five-jointed antennal fimicle and from Pity- 

 ophthorus and Hypothcucmns by the fringed antennal club and 

 the " outer part of the funicle very short " respectively. 



1895. Blandford, W. F. H.(24). 



Blandford placed Gnathotrichus in his subgroup V Pityophthori 

 which comprises the genera Styphlosoma Blandford, Dcndro- 

 tertis Blandford, Pityophthorus Eichh. and Gnathotrichus Eichh. 

 He regarded Gnathotrichus as standing midway between Pityoph- 

 thorus and the Corthyli. 



The author felt himself that the first two genera of this subgroup 

 have very little in common with the latter two ; they were included 

 in this subgroup more on account of the difficulty of placing them 

 elsewhere. 



1909. Swaine, J. M.(4o). 

 Only references to literature. 



1910. HaGEDORN, M.(z|J2). 



References only. 



1910. Hagedorn, M.(4i). 



Based on the characters of the mouthparts, Hagedorn placed the 

 genus Gnathotrichus in his subfamily Sactidcntatac. His descrip- 

 tion is as follows : 



Kaukante des Mittelkiefers mit Borsten besetzt. 



