LAMPYRJDAE. 209 



Metatlioracic side pieces wide. 2. 



Metathoracic side pieces narrow. 3. 



2. Prosternum well developed in front of coxae ; front convex, narrowed 

 between the antennae, which are ramose. Pterotini. 



Prosternum very short as usual ; front flat, labrum large, antennae 

 plumose. Phengodini. 



3. Prosternum well developed ; front convex, labrum small and indistinct. 



Mastunoceriki. 



Sub-Tribe 1.— Pterotini. 



Pterotus Lee, with one Californian species, is the only repre- 

 sentative of this sub-tribe. 



Sub-Tribe 2.— Pliengodiiii. 



The labrum is large ; metathoracic side pieces wide. 



Elytra subulate, tarsi with fourth joint lobed. Phengodes. 



Elytra entire, tarsi with third and fourth joints lobed Zarhipis. 



Sub-Tribe o.^Mastinoceriiii. 



These arc small, slender insects, having the antennae biramose, 

 or serrate, but not plumose as in Phengodini, the branches being 

 less slender. The eyes are small, lateral, and convex; the epi- 

 stome is somewhat convex, and the labrum is small and indistinct ; 

 the mandibles are acute but not prominent. The maxillary palpi 

 are long, the labial very short; the gula is less deeply excavated 

 than in Pheiujodes. The side pieces of metnthorax are long and 

 narrow, diagonally divided, with the epimera exposed. The elytra 

 are short, dehiscent, and rounded at tip. 



Antennae ramost^ ; 



Lateral margin of prothorax acute; palpi broad. Mastinocerus. 



Lateral margin of prothorax obliterated in front; palpi slender. 



Cenophengus. 

 Antennae serrate. Tyttlioi.yx. 



Sub-Family III.— TELEPIIORIN J^^. 



The insects of this sub-family are closely related to the Lam- 

 pyrina;, but are easily known by the stronger develo))ment of 

 the mcMith organs, the smaller size of the eyes, which permits 

 the antenuic to be widely separated at the base, and by the 

 straight, or nearly straight outline of the inner side of the meta- 

 thoracic episterna. 

 14 



