390 
Transformation to the pupa took x)lace two or three days after th 
receipt of the specimen, and the general characteristics of this stag 
are sufficiently indicated in the illustration (Fig. 43 e). The pupa was 
preserved in alcohol, but the adults, from previous observations and 
reariugs, issue, as indicated in the article cited at the outset, from th 
middle to the last of May. Arrangements have been made with Mr 
Treat to continue the study of this insect, and particularly to deter 
mine whether the great mortality in the eggs, in last season's experi 
ence, may be relied on as a normal feature. 
Three nearly full-grown larvse of this insect in currant twigs wer 
received August 10, 1892, from Mr. E. W. Claypole, Akron, Ohio 
One of these, which was saved to rear the adult, spun up in August 
indicating an early completion of larval growth and a larval dor 
mancy of upward of nine months. 
OBSERVATIONS ON CERTAIN THRIPIDiE. 
By Th. Pekgande. 
Thus far only two species belonging to the genus Heliothrips have 
been described. 
The most common and destructive of these two species to the foliage 
of hothouse plants iu general, both in Europe and in this country, was 
described by P. Fr. Bouche, in his Naturgeschichte der schadlichen 
und niitzlichen Garten -Insekten, in 1833 (p. 42) under the name of 
Thrips hcvmorrhoidalis. It is a rather stout, black species, with pale 
yellow legs, almost colorless wings, and the end of the abdomen red. 
The other species, much less common, although it may be found in 
almost every hothouse, becomes sometimes also quite destructive to 
various kinds of plants, particularly the Dracaenas. It was described 
by E. Heeger ( Sitzungsb. d. mathem.-naturw. Klasse d. Wissensch., vol. 
xiv, 1854, p. 365) under the name of Heliothrips draccenw. This is a 
yellowish-brown species with rather long and narrow white wings, 
which are ornamented with a brownish band across the basal third; 
two brownish spots or interrupted band beyond the middle and a spot 
near the apex. 
Both were probably introduced with ornamental plants from the 
warmer regions of America, at least the first-named species, which is 
fouod upon wild and cultivated plants in Brazil. 
HELIOTHRIPS CESTUI SP. NOV. 
To these I have to add now two additional new species. One, which 
I shall call Heliothrijys cestri, has been known to me since 1884, when 
specimens were presented to me by Mr. B. P. Mann, who discovered 
them infesting a plant of Oestrum nocturnum, brought from Massachu- 
setts. About the same time it was also sent me by Prof. O. M. Reuter, 
Helsiogfors, Finland. 
