(50 AN INTRODUCTION TO ENTOMOLOGY. 



C. The spring an appendage of the penultimate (fifth) abdominal segment. 



3. ENTOMOI 



CC. The spring an appendage of the antipenultimate (fourth) abdominal 

 segment. 4. PODURID^. 



AA. Non-saltatorial. 



B. Mouth mandibulate. 5. LIPURIDJE. 



BB. Mouth suctorial. 6. ANOURID^E. 



Family I. P.xri kin >.*;. Two genera of this family have been 

 established. Papirius is characterized by four-jointed antenna- : and 

 Dicyrtotna by having the antennae eight-jointed. A large 

 from Maine and Massachusetts, measuring 2^ mm. (o. i in.) in length, 

 is described by Packard under the name Papirius martnoratus. \ 

 marbled with deep dull lilac and pearl-colored lines and spots. 



Family II. SMVM nfkiD.!:. Only a single genus of this family, 

 Smynthurus, has been described. In this genus the antenna: arc 

 four-jointed, and the respiratory system is well developed. The 

 presence of tracheae enable these insects to live in drier situations 

 than can other members of the sub-order. The Garden Flea, Smyn- 

 thurus hortcnsis, is described by Fitch as occurring abundantly in 

 May and June, upon the leaves of young cabbage, turnip, cucumber, 

 and various other plants, and also on the ground. It is dull black. 

 with the head, legs, and bases of the antennae rust-color. Several 

 other species of this genus have been described by Fitch and 

 Packard. 



Family III. ENTOMOBR?ID/E. This is by far the largest family 

 in this order; nine genera having been described. These can 

 separated by the following table, which is from one given by Lub- 

 bock: 



A. Antennae six-jointed. ORCHESELLA. 



A A. Antennas four- or five-jointed. 

 B. With scales. 



C. Terminal segments of antennae ringed. 

 D. Two terminal segments ringed. 



E. Eyes seven in each group. iScERUS. 



E. Eyes absent. TRITOMURUS. 



D. Third segment simple. I i MPLETONIA. 



CC. Terminal segment of antennas simple. 



D. No eyes. MA, 



DD! With eyes. 

 E. Head exposed. SEI'KA. 



* The Degeeriadae of Lubbock. The generic name Degeeria falls owing to its hav- 

 ing been previously used in the Diptera. 



