188 Timehri. 
The equipment required for a start is not large. Some fine entomological pins 
(No. 20), some cards round or square, # of an inch in diameter, some stout pins, 
a pair of forceps and a store box as nearly as possible airtight, lined with cork 
or eta palm pith covered with white paper will suffice. For cards it may be 
remarked visiting cards cut up very nicely for the purpose and you may immor- 
talize your friend by using his pasteboard to pin a newly-discovered species. 
The system of classification most generally accepted is that of Mr. Fred V. 
Theobald, Vice-President and Zoologist of the South Eastern Agricultural College, 
which is, in its latest form, modified from that of Dr. Lutz. It is based largely on 
the scale characters of the adult insects. So far as knowledge of the life history of 
the various species has been carried, there is considerable divergence from this 
system in the grouping of Culicide by Drs. Dyar and Felt based on male genitalia 
and in that based on larval characters and life habits. Dr. Dyar and Mr. F. 
Knab, of the States Bureau of Agriculture. have gathered a mass of accurate 
information on these points which has led them to consider many of Theobald’s 
generic distinctions invalid. There are, in spite of the difficulties in applying 
some of Theobald’s characters, some advantages in an arrangement of species 
based on adult characters and, as his system is still that of reference by most 
writers in English, we retain it in the subjoined tables. 
In this classification Corethra and Mochlonyx are separated from Culicidze 
and placed in a separate Family Corethride. The Culicide include the Sub- 
Families Anophiline, straight of proboscis and with palpi long in both male and 
female, Megarhinine, curved of proboscis with long palpi in male and long or 
short in female and, between these, the great mass of species is grouped under 
Orthorhynche. This group is divided into nude metanotum species (Metanotop- 
sil) and ornate metanotum species (Metanototriche) in which scales or chaetae 
adorn that part. Each of these sub-groups are again divided by palpal characters 
into Heteropalpe and Micropalpe or, as a further refinement in the Metano- 
totrichs, Isomicropalpe. The Heteropalps have long male, short female palps, 
the Micropalps both sexes short, the standard of comparison being the length 
of the proboscis. 
The Orthorhynch Metanotopsilous type are the Heteropalp Sub-Families Culi- 
cine which contains over 60 genera and Heptaphlebomyine with one Genus 
Heptaphlebomyia ; the Micropalp Aedinz with nine Genera, Uranotenine 
with nine genera and Denioceratine with two genera ; the Metanototrichons type 
are the Heteropalp Sub-Family Trichoprosoponine with six genera and the 
Isomicropalp Dendromyine with eleven genera and Limatine with one genus 
Limatus and one species Durhami. All these Sub-Families are represented in 
British Guiana with the exception of Heptaphlebomyine in which the special 
character is the development in the wing o° a distinct seventh vein with 
scales. In compiling the following tables | have as far as possib'e 1e-examined 
the material in my possession and in some cases modified the diagnosis with 
special reference to local types. The following is Mr. Theobald’s synopsis of the 
Sub-Families. Iu most cases I prefer the term ‘“ cuneiform ’’ to the rather 
inadequate description “ forked,’’ for the scales indented and spread at apex 
formed on the heads of most mosquitoes. 
