



275 
accomplis par la mission de l’Etude de la Cochylis et de 
l’Eudemis pendant l’année 1911 p. 1—326. 
However as a review of these fights lies far from the 
limits of this article and such a review besides would fill 
several volumes, I will only add that those who are in- 
terested in the subject and wish for further details should 
refer to the above mentioned american work, and the five 
years of the „Review of applied Entomology, Series A. 
Agricultural" at present issued, in which can be found 
a short summary of all the important articles concerning 
this work. 
With regard to the number of species already known 
the following have been described from Europe. — 
1833 Tr. evanescens Westw. Britannia. Philos Magaz. (3) II. 1833. p. 444. 
1851 Tr. vitripenne Walker. Britannia. Ann. Mag. Nat. Hist. (2) VII. 
1851. p. 212. 
1907 Pentarthron carpocapsae. Schreiner. Russia. Plodovodstov. 1907. 
(711-715). 
1897 Oophthora semblidis. Aurivillius. Suecia. Ent. Tidskrift. 1897. 
p. 249 — 256. 
1914 Th. piniperdae. Wolff. Germania. XL. Vers. Preuss. Forstv. z. 
Braunsberg. 9 u 10 Juni. 1913. S. 84. 
1915 , ” Wolff. Zeit fur Forst- und Jagdwesen. XLVII. 
Jahrg. 8. H. p. 543. Kp. 
It is not my object with this present work absolutely 
to deny the possibility of there being more than one Euro- 
pean species of the genus 7richogramma, | will even not 
refuse the possibility that the future will acknowledge 
three species viz: 
evanescens Westwood. 
semblidis Aurivillius. 
piniperda Wolff. 
although I may add I have examined many thousands 
specimens, bred from eggs of Lepidoptera as well as Sialis 
eggs, and caught specimens, but I am quite unable to find 
any real difference between them. Beyond some variation 
of colour and size I can see nothing. The respective pro- 
18* 
