255 
collecting in the propagating pits as well as the larger houses ; oti 
the first occasion a single specimen of Heliothrips haemorrhoidalis, 
were captured, It is probable that the various ants which swarm 
in most of the houses help to keep down the thrips; the writer has 
found many species of hothouse thrips freely in several well-regulated 
and attended houses where ants are absent or scarce, but has always 
found thrips to be very scarce in houses infested by ants. 
THYSANOPTERA. 
TEREBRANTIA. 
THRIPIDAER, 
Anaphothrips orchidaceus, Bagnall : Ent. Mon, Mag., 2nd ser., xx., 
p. 33, and Ann, de la Soc. Entomologique de Belgique, liii., p. 171, 1909. 
Collected by the late Mr. G. Nicholson from Zygopetalum, and by 
the writer from Epidendrum and Cymbidium (Feb. 2nd, 1909). It 
also occurs on Cypripedium and Odontoglossum. 
Heliothrips haemorrhoidalis, Bouché, and H. haemorrhoidalis var. 
abdominalis, Reuter. 
n various hothouse plants. 
H. femoralis, Reuter. 
Collected by the late Mr. G. Nicholson from Lissochilus Sp. 
Lardizabala biternata, Agonis flexuosa, and Hibbertia dentata, and 
by the writer from Prteris sp. 
Parthenothrips dracaenae, Heeger. 
Collected by the late Mr. G. Nicholson from Dracaena sp. 
Thrips tabaci, Lindeman (7. communis, Uzel). : 
Larvae and perfect insect on [resine spp. in one of the propagating 
houses, Feb. 2nd, 1909. 
PISCES. 
