LIOGENYS.— DIPLOTAXIS. 157 



Of this there is also only a single female example. It is of a bright metallic colour 

 and certainly distinct from L. pubereus, but its genus cannot be determined without 

 a knowledge of the other sex. 



DIPLOTAXIS. 



Diplotaxis, Kirby, Fauna Bor.-Amer. iv. p. 129 (1840) ■ Lacordaire, Gen. Col. iii. p. 275 (1856) ; 

 Leconte, Journ. Acad. Nat. Sc. Phil. 2nd ser. iii. p. 265 (1856). 



A genus apparently confined to North America, represented by numerous species in 

 the United States and Mexico, but not extending further south than Costa Rica, though 

 one species occurs in the West Indies. About forty species have been described. 



I. Clypeus (prascipue in 6 ) quadratics, antice late sinuatus ; corpore recumbenti- 



cinereo-setoso. 



1. Diplotaxis pilifera. (Tab. IX. fig. 22, s .) 



Liogenijs pilifera, Burm. Handb. der Ent. iv. 2, p. 16 \ 

 Eab. Mexico \ Iguala in Guerrero (Edge). 



The tarsi are remarkably short in both sexes, fringed beneath with hairs, the joints 

 1-3 of the two anterior pairs densely hairy. The sixth ventral segment is conspicuous 

 in both sexes. 



2. Diplotaxis clypeata. (Tab. IX. fig. 23.) 



Angustior, viridi-scbistacea vel cuprea, elytris interdum (immatura ?) castaneis, breviter albido-setosis, setis in 

 elytris (si cut in D. pilifera) lineatim ordinatis, antennis nigris, tibiis tarsisque plerumque testaceo-rufis ; 

 creberrime punctata, subopaca ; thorace sat parvo, antice angustato, angulis posticis rotundatis ; elytris 

 costis parum elevatis, punctatis ; ventris segmento 6° parvo ; tibiis anticis tridentatis ; tarsis omnibus sat 

 gracilibus, unguibus dente apicali inferiore nee latiore nee magis curvato. 



3 . Clypeus magis quadratus, angulis anticis subproductis. Tarsi subtus sparsim breviter setosi. Segmenta 

 ventralia medio setis rigidis armata. 



2 . Clypeus trapezoideus. Tarsi paullo breviores, subtus sparsissime setosi. 



Long. 6-7 millim. 



Hal, Mexico, Yolos {Salle). 



Named Philochlasnia clypeata (Deyr., MS.) in the Salle collection ; but the broadly 

 arcuated labrum and the non-elongated fifth ventral segment show that it does not 

 belong to the same subfamily even as Philochlamia. The short bristly clothing and 

 (in the male) rather elongate and quadrate clypeus of this and the preceding species, 

 though opposed to the typical forms of Diplotaxis, cannot suffice to distinguish them 

 generically from that genus. 



The totally different clothing of the soles of the male tarsi and the length of the 

 joints in species so very closely allied in other respects as D. clypeata and D. pilifera 

 show what abrupt variations have been at work in the group. 



