284 
NORTH AMERICAN MYRMOSIDAE 
Second segment of the petiole swollen but not stronglj^ gibbous, its sides 
but slightly convex; R4 and Rs sinuate, slightly divergent above, the cell 
R4 nearly rhoinboidal heathii Melander 
4. Length, 7 to 8 mm.; headpiceous; second segment of flagellum longer than 
the first similis Baker 
Length, 11 to 12 mm.; head concolorous; second segment of the flagellum 
of a length equal to that of the first , albipes (Cresson) 
5. Metasternum with a strongly elevated prominence in front of each coxa; 
mesosternum with a small tooth cephalo-mesad of each coxa (6) 
Metasternum with a small tubercle in front of each coxa; mesosternum 
with a transverse ridge in front of the coxae (Lower California). 
peninsularis Fox 
6. Apical part of petiole ovate (7) 
Apical part of petiole globose; posterior ocelli nearer the compound eyes 
than to each other calexicensis new species 
7. Pubescence on apical portion of abdomen yellow; abdomen castaneous 
throughout melaniceps (Blake) 
Pubescence on apical portion of abdomen white; third dorsal segment 
black or with a transverse black band belfragei (Blake) 
Females 
As I have not studied the females of this genus I refer the 
reader to the table by Fox.® As peculiaris (Cresson) is now re- 
moved to another genus, the table may be commenced at cate- 
gory 2. 
Chyphotes peninsularis Fox, cf- 
Lower California: [Type, American Entomological Society]. 
Chyphotes calexicensis new species 
cf. Two submarginal cells, the second as long as the first; metasternum 
wnth two strong, flattened processes; petiole very strongly gilibous behind; 
pubescence yellowish at tip of the abdomen. 
Testaceous, head except face black; abdomen reddish-testaceous; flagel- 
lum yellow; scape and legs pale straw-colored; face and base of mandibles 
testaceous, their tips black; entire insect covered with very noticeable, long, 
silky, white pubescence, stained yellow toward the apex of the abdomen. 
Length, 12.5 mm. ; of fore-wing, 8.4 mm. 
®Transactions of the American Entomological Societj', 1899, 25: 275. 
