500 HEMIPTEROLOGICAL GLEANINGS 



and male are unknown to me. This inconspicuous little species 

 might be considered as a small dark variety of simplex were it 

 not for the narrower and distinctly oval front. 



In my description of decor atus (Proc. Acad. Nat. Sci. 

 Phila., lix., p. 492,) I inadvertently neglected to give the 

 length which should have been 3 mm. 



Genus Lamenia Stal. 



There has been some controversy as to the proper system- 

 atic position of genus Lamenia, Stal placing it in the Derbince. 

 Ashmead in the Flatincz and Kirkaldy in the Cixiince, the 

 latter claiming that the termination of the claval vein on the 

 commissure excludes it from the Derbince entirely. A careful 

 study of this and the related genera convinces me that Stal was 

 correct in placing it in the Derbince. The elytral venation in 

 this subfamily presents a wide variation not only among the 

 genera but in a less degree among the species. In the more 

 typical forms of Lamenia, those allied to vulgaris, the claval 

 vein certainly attains the commissure before the apex of the 

 clavus but in uhleri it can be distinctly traced to the apex and 

 in Mysidia and some allied genera both the claval vein and the 

 suture make an abrupt curve to the commissure. I think a more 

 rational classification would distinguish this subfamily and the 

 DelphacincB by their elongated and more or less flattened anten- 

 nas, and would connect them with the other Fulgoridae through 

 Flatoides and the allied genera of the Flatince in which the 

 antennas have two joints somewhat elongated but scarcely 

 flattened. The DelphacincB with two extended joints and the 

 Derbince with one I believe are strictly parallel groups follow- 

 ing the Flatince, but unfortunately we cannot so place them in 

 a linear arrangement. 



I would, therefore, consider Lamenia our most primative 

 form of the Derbince as it has the antennae but slightly enlarged 

 and flattened, the front proportionately broad and the elytral 

 venation simple. It is but a step to Cenchrea in which the ven- 

 ation is more characteristic, the antennae more flattened and 

 the front narrower and more deeply sulcate. Patara, Anotia 

 and Amalopota show still more specialization while in Otiocerus 

 we reach the extreme in which the antennae are split into two 

 or more filaments and the front has disappeared entirely in a 

 foliaceous and deeply sulcate carina. In the South American 



