894. CHARLES PauL ALEXANDER 
which live in similar habitats should be considered. Howard, Dyar, and 
Knab (1915:213) say, in describing these mosquitoes: 
These crab-hole inhabiting species possess peculiarly developed antennae in order, as we 
suppose, to enable them to detect the approach of their crustacean host and fly out of the 
holes before being overwhelmed in the water in the bottom by the incursion of. the crab, 
whose body must completely fill the entrance to the hole. 
It is curious and suggestive that the males of Polymera should likewise 
possess elongated and very complicated antennae. 
Tribe Pediciini 
The Pediciini constitutes a small tribe which seems to be divisible into 
two well-marked subtribes, the more generalized Adelphomyaria indicating 
a relationship with the Hexatomini. 
The larvae of the Pediciini have the labrum broad and the epipharynx 
usually feebly armed. The mentum is completely divided into two parts, 
each half with not more than four, usually three, teeth. The hypopharynx 
is labriform. The maxilla consists of two lobes, distinct and separate 
in the Adelphomyaria, more or less approximated or fused in the Pedi- 
caria. The mandible is powerful, ending in a strong apical point; the 
cutting edge has about four teeth; there is a simple tuft of setae on the 
prosthecal region in the Dicranotae and in Pedicia. The head capsule 
is very elongate, massive, and compact, with the posterior incisions very 
shallow. In the Adelphomyaria the cauda is surrounded by four lobes 
which are fringed with exceedingly elongate hairs; in the Pedicaria there 
are two ventral caudal lobes, each tipped with a very few setae. The 
anal gills are four in number and are segmented, the terminal segment 
being more or less retractile. In the Pedicaria prolegs are developed 
on the abdominal segments of some of the genera. 
All of the species of the tribe, so far as is known to the writer, are 
carnivorous in their larval state, which is spent in mud or earth close to 
water. 
‘The two subtribes of the Pediciini may be separated as follows: 
Larvae 
Spiracular lobes four in number, fringed with very long, delicate hairs. : 
Adelphomyaria (p. 895) 
Spiracular lobes two in number, ventral in position, each tipped with from six to eight setae. 
Pedicaria (p. 899) 
