_Labels for pinned Specimens._--The following labels should be employed in the collection: (1) _Locality label_, which should be as explicit as possible. (2) _Date of capture_, which is very useful and sometimes quite important in various ways. It indicates at what time additional specimens of some rare species may be secured, and greatly assists in elaborating the life history of the species, and in other cases assists in the correct determination of closely allied insects, which differ chiefly in habit or date of appearance. (3) _A label to indicate the sex_. This label has recently acquired greater importance than formerly, on account of the value of the sexual differences in the distinction of species. The well-known signs for male, female, and worker, printed in convenient form, are well adapted for collections. (4) _The name of the collector_. This label is of less value, but sometimes becomes important in determining the history of the specimen or the exact place of capture. The name of the species is not necessarily attached to all the specimens in a collection, and ordinarily will be placed with the first specimen in a series in the cabinet. This and other labeling of insects in cabinet is discussed in another place. Other labels are useful to indicate type specimens, namely, those of which descriptions have been drawn up and published, and which should be designated by a special label written by the author himself. Determinations by an authority in a special group should be indicated, and the labels placed on specimens by such an authority should not be removed. It will not be found necessary to use a separate label for each of the data indicated above, and a single label may be made to combine many of them, as, except for the specific names of the insects themselves (which should always be on the lowermost label), most other words will bear abbreviation, especially localities and dates. "A combination label, which has given general satisfaction to all to whom it has been communicated, is a two-line label printed in diamond type, on heavy writing paper. The upper line consists of the name of the locality, _e. g._, 'Washngtn' (a name consisting of more than eight letters to be abbreviated), and the lower line has at the right-hand corner 'DC' (interpunctuation and spacing to be avoided so as to save space). This leaves on the second line sufficient room for inserting the date, which can be quickly and neatly written with ink if the labels are printed in columns of ten or more repetitions. The label thus combines locality with date of capture. Or the upper line reads 'Arizona' and the lower line 'Morrison,' the label thus combining locality with the name of the collector."[8] [8] E. A. Schwarz, Proc. Ent. Soc., Wash., II, No. 1, 1891.