MOXOGrwVPII OF Till-: LABOULBKMACE-E. 245 
Total nnmbcrs of hosts in the different families of tliis order : 
Nyctcribida) 
Diopsida) 
Droso])]nlida) 
Muscida3 • 
Total number of hosts belonging to flic order Neuroptcra . . 
giMiern, 3 ; Rprrics, 3 
*' 1; ** 1 
i( 1 • c< O 
u 1; « 1 
1 
A single family Termites genus, 1 ; spccii-s, 1 
Total number of hosts belonging to the order Araclinida 
1 
A single family GasmiJa: . . . . g<'nu8, 1 ; spocics,! 
In comparing the species and genera represented by these hosts it is noticeable 
that although the Carabida? exceed all other families as regards the niiiiil)or of genera 
and of species, both of hosts and parasites, the number of genera by which they 
are infested is comparative!}^ small. Of the seventy-five species of Laboulbcniacoro 
which are found on members of this famil}^ sixty-five belong to the single genus 
I 
e remammg 
distributed among but five genera, D 
myces, Peyritschiella, Enarthromyces, and RhachomyccF. In the case of the Staphy- 
linida3, however, which, next to the Carabida?, includes more hosts than any other 
family, the proportions in this respect are quite different. For althoufli the ;;enu3 
Laboulbenia predominates to such a degree in the Carabida) and infests all of the 
orders, and a majority of the families given in the above table: among the fifty species 
known on members of the Staphylinida?, but four belong to this genus, while tlie 
remaining forty-two are distributed among no less than eighteen genera. The last 
mentioned family is thus by far the most interesting in this connection, and its para- 
sites abound in peculiar forms. 
It is further observable that the aquatic hosts, witli the exception of tlie Gyrinidae, 
the species of which swim on the surface of the water and carry their hosts at least 
partly exposed to the air during much of their existence, are infested only by mem- 
bers of the three genera Zodiomyces, Ceratomyces, Ilydraeomyces, and Chitonomyces, 
of which the two first mentioned are the only representatives of the group of 
"exogenae," producing their antherozoids exogenously. 
In general, it is true that among the Coleoptera infested a mnjority are eitiier 
riparian or aquatic in their habits; yet there are a number of foruis that occur upon 
insects wdiich live away from the water and often inhabit rather dry situation*'. Of 
these, Chilocorus is perhaps the best example ; while, outside the Coleoptera, tlie com- 
mon house-fly affords a conspicuous instance of a host very subject to tliis parasitism, 
yet far from riparian in its habit. Peyrltsch notes the fact that, in his experience, 
