1878. ] 585 {Horn. 
closed behind, although very narrowly in Bothrideres. Middle cox widely 
separated. Posterior coxze small oval, very widely separated. Metasternal 
side pieces narrow. Ventral segments unequal, the first elongate, the next 
three sub-equal, the fifth slightly longer. Trochanters closely connate with 
the femora. Tarsi moderate, first joint always longer than either of the 
two following, the three longer than the fourth. Anterior tibiz with one 
terminal spur. 
Of the genera placed here by Erichson, Bothrideres alone 
remains. As a tribe this is probably the best detined of all, 
exhibiting in our fauna less affinity with the other tribes 
than they do among themselves. 
Our genera are two in number. 
Head horizontal or nearly so; anterior cox narrowly closed behind, 
tibiz not prolonged at outer angle. 
Antenne? 11-jointed; club’2-jointed... 2. 205.022. fee e dee s's Bothrideres. 
Head deflexed ; outer angle of anterior tibix prolonged; anterior cox 
very distinctly closed behind. 
wenitennee Id _joumted. Clu 2-jOMUCM. 0 cc. ce ns onsen a wcn eos Machlotes. 
(Antenne 9-jointed, club with one solid joint............ Emma gleeus.) 
The latter genus has no place in our fauna, but has been 
introduced to show its correct position. Fairmaire describes 
the antenn as 11-jointed, but I can find but nine, the struc- 
ture of these, and an excellent figure being given by Lacor- 
daire, Genera, Atlas, pl. 17, fig. 5, reference to which is 
omitted in the Munich Catalogue. yy Po bet 
MACHLOTES Pasc. 
Prolyctus Zimm. Trans. Am. Ent. Soc. 1869, p. 274. 
Antenne eleven-jointed, terminated by a small club of two joints, first 
joint stout, oval, second a little longer than the next, three to nine small, 
equal, tenth triangular truncate, eleventh small, transversely oval, par- 
tially retractile ; base of antenn free, received in repose in short, oblique 
grooves. Head deeply inserted, broader than long, deflexed, side margin 
acutely incised over the insertion of the antenne. Eyes transversely oval, 
moderately prominent, coarsely granulated. Gular region deeply emargi- 
nate, the lateral plates concealing the maxillz, mentum short, transverse, 
deeply, transversely impressed, last joint of palpi elongate conical. Ante- 
rior cox widely distant. Middle coxze equally distant. Posterior cox 
small, oval, very widely distant. Anterior tibize dilated at lip, the outer 
apical angle spiniform, outer edge with few denticulations, terminated by 
a single stout spur. Middle and posterior tibie not dilated, terminated by 
two short spurs. Trochanters of all the legs connate, with the femora with- 
out suture. Tarsi not elongated, first and fourth joints sub-equal, either 
PROC. AMER. PHILOS. SOc. xvil. 101. 3U. PRINTED JUNE 3, 1878. 
