FROM THE society's GARDENS. 283 



Trichodectes ovis Linn. 



Specimens from Ovis onusimon Linn. Also been recorded from 

 O. aries, 0. oru.ata, 0. melanocephala. 



Trichodectes sp. 



12 $ $ from Capreolus capreolus Linn, The specimens 

 belong to the much confused tibialis-grou-p of Trichodectes from 

 Deer. It is thoroughly unsafe to identify specimens of this 

 series from females until the confusion, caused chiefly by the 

 absence of moiphological evidence in previous descriptions and 

 figures, has been dispelled. These females certainly are not 

 T. tibialis, but agree most with some unnamed Trichodects from 

 Keed-Buck (Africa), shown me by Mr. Waterston among some 

 material belonging to the Imperial Bureau of Entomology. 



Genus EuTRiCHOPHiLUS Mjoberg. 



EuTRiCHOPHiLUS SETOsus (Gieb.) (10, p. 56). (Text-fig. 17.) 



37 2 $ from Erithizon dorsatum Linn. 



I have been able to make a preparation of the male copulatory 

 apparatus from a male contained in a tube of this species presented 

 to the British Museum by the Hon. N. C. Kothschild. In many 

 .species of Trichodectidae, males are rai'e and in T. scalaris N. 

 unknown. 



The Family Trichodectidfe consists at present of but thi'ee 

 genera — Trichodectes, Dainalinia, and Eutrichophilus. Before 

 Damalinia and E%drichop)hilus were split otif in 1910 by Mjoberg, 

 the old genus Trichodectes was simply a miscellany, which still 

 requires breaking up into genera— a by no means easy task, on 

 account of the difficulty in finding convincing characters. In 

 view of a future revision of the family, attention is drawn to 

 the probable value of the male genitalia systematically. I find, 

 for example, that in Eutrichojyhiliis setostcs and in E. coenda 

 •Stobbe (15) the male genitalia are of quite the same type. This 

 is described below. Another type, perfectly distinct, is formed 

 by Trichodectes latus, T. crassus, T. pingiiis, and probably by 

 ■others (see p. 271). Still another type may be seen in the 

 male genitalia of Trichodectes gastrodes Cummings (16, p. 99), 

 T. viephitidis Osborn (17, p. 242), T. geomydis Osborn (18, p. 54), 

 ■and T . interriipto-fasciatus Kell. &, Ferris (19, p. 61), which agree 

 in the fusion of the para meres at their distal ends and in the bifid 

 form of the endomeres (see 16, text-fig. 4 ; and 19, pi. vii. fig, 2, 

 pi. viii. figs. 4 & 6). 



Male Copulatory Appa.ratus (text-fig, 17), — Basal plate : Broad 

 anteriorly narrowing gradually to the posterior end, where the 

 plate is constricted into a narrow " waist," to which the endo- 

 meres and parameres ai^e attached. The lateral margins are 

 marrow, rod-like, the posterior third broader. The antei'ior part 

 ■of the plate, as is frequently the case, is thinned out, composed 

 .of delicate chitin with an almost invisible anterior margin. 



