Vol. XXXl] EXTOMOLOGJCAL NEWS 155 



cribed to the ocelli of adult insects (in addition to the func- 

 tion of distinguishing objects close at hand) and if the ocelli 

 of these nymphs are wholly functionless, the fact should be 

 brought out by experiment before it is stated as though it 

 had been conclusively proven. 



Dr. MacGillivray's statement that "Ocelli are never pres- 

 ent in ametabolous insects" appears to be entirely too sweep- 

 ing. All of the insects belonging to the ametabolous group 

 Machiloidea (which is considered as an order by many ento- 

 mologists) appear to have exceptionally large and well devel- 

 oped ocelli. In fact, the ocelli of these insects are propor- 

 tionately much larger than those of any other insects I know 

 of, so that Dr. MacGillivray's statement in this matter can be 

 accepted only with reservations.* 



In calling attention to these exceptions to the general state- 

 ments made in Dr. MacGillivray's paper, I would not min- 

 imize the value of the principal points brought out in his 

 article, since in the main these points are quite correct, and 

 are well taken. On the other hand, the exceptions to his 

 general statements are in some cases of sufficient importance 

 to merit mention, and should therefore be called to the atten- 

 tion of students who are referred to Dr. MacGillivray's paper 

 in their general reading, or of anyone who contemplates mak- 

 ing a much-needed study of the different types of eyes found 

 among insects. 



The known Membracidae of Ecuador (Homop.) 



By DR. FREDERICK W. CODING, Guayaquil, Ecuador. 



(Continued from page 136) 



*Triquetra inermis Fairm. Rev. Mem. p. 280. Hab.: Province of El 

 Oriente, (Goodfellow) ; Macas, Province of Chimborazo, (Feyer). 



Triquetra obtusa Fowl. Tr. Ent. Soc. Lond. (1894), p. 417. Hab.: 

 Province of El Oriente, (Goodfellow). 



* In many ametabolous insects, as Dr. MacGillivray points out, simple 

 eyes occur in the position which compound eyes occupy when present in 

 higher insects. In the ametabolous group Machiloidea, however, there are 

 well-developed compound eyes of the normal type, and in addition to 

 these, the Machiloidea have three ocelli located on the frontal region as in 

 higher insects. 



