OF WASHINGTON. 65 



teresting Coccids found by Prof. Tourney in Arizona on mesquite 

 are all different from the equally interesting ones found in the 

 Mesilla Valley, New Mexico, on the same plant. Similai'ly, the 

 same species of oak, which in the Organ Mts., N. M., fur 

 nishes Kermes galliformis and Chionaspis quercus, at Pinos 

 Altos, N. M., gives us Kermes galliformis, Aspidiotusancylus, 

 Aulacaspis montana and Ollijfiella cristicola. Such instances 

 could be multiplied almost indefinitely. It is the same, to a 

 considerable extent, with even the bee-visitors to the flowers. 

 The beautiful Melissodes luteicornis, common at mesquite 

 flowers at and near Rincon, N. M., I have never seen in the 

 Mesilla Valley. A short search one day at San Marcial, N. M., 

 gave me four species of Perdita on Larreaj the same Larrea 

 abounds in the Mesilla Valley, but several times this year I 

 looked on it for those bees, and never found one of them. 



(2) Lecaniobizis cockerellii is an important parasite of Le- 

 canium begonice, Dougl., in Antigua; it is the species referred 

 to in Bull. Bot. Dep. Jamaica, May, 1894, p. 70. The name 



fraternum is a MS. synonym of begonice ; it was never pub 

 lished by me. 



(3) In the discussion on Scutellista cyanea, this insect seems 

 to be regarded only as a parasite of Ceroplastes. But Nietner 

 records it as parasitic on Lecanium coffece, a species which is 

 very doubtfully distinct from our common L. hemisphcericum ; 

 so if introduced into this country it should surely attack the 

 latter. 



(4) Mr. Ashmead states that no females of Labidus have 

 been found. It is generally admitted that Labidus and Eciton 

 are one, and some years ago M. Ernest Andre described a pecu 

 liar insect taken in Mexico (I believe by Dr. A. Duges, though 

 it is not so stated), as Pseudodichthadia incerta, which he sur 

 mised might be the female of Eciton. In a letter to me, dated 

 August 1 6, 1896, M. Andre speaks with positive assurance of 

 the Pseudodichthadia\5Z\\\<g Eciton (=Labidus}, so we must 

 consider that the Q Labidus is known, if only in a single species. 

 M. Andre suggests that perhaps these females do not come to 

 the light at all, but remain underground ; he also remarks that it 

 is possible that a nest contains but a single female. 



MESILLA, N. M., Nov. 19, 1896. 



In discussing this paper Mr. Ashmead said that he was perfectly 

 aware of the conclusion of Emery and Mayras to the identity of 

 Eciton and Labidus, but that he had questioned this conclusion 



