654 STAPHYLINIDA. 
The male of this species has the legs a good deal incrassate, especially the hind 
femora; it has a rather broad short excision on the last ventral plate, and the preceding 
plate rather broadly, though slightly, deplanate and finely pubescent. 
We have received only two males of this species; though this sex, on account of its 
incrassate hind legs, is not difficult to distinguish from S. docilis, it is possible that 
the discrimination of the female will be far from easy; but probably the fact that the 
palpi are a little more elongate in S. dajulus will be a clue to its identification ; the 
sculpture of the thorax and elytra appears to be rather denser. 
33. Stenus alumnus. 
Parvus, nigro-eneus, tenuissime pubescens, parum nitidus ; antennis, palpis pedibusque testaceis; densissime 
fortiter punctatus, subrugosus ; capite fere plano. 
Long. 3-4 millim. 
Hab. Mexico, Mirador (Hége), Guanajuato (Sal/é); GUATEMALA, near the city, San 
Gerdénimo (Champion). 
This, one of the smallest Stent of our region, is closely allied to S. docilis, but 
slightly smaller, more densely and rugosely, though not so coarsely, punctured, 
less shining, the antenne frequently entirely flavescent, the space at the back of the 
head between the eyes considerably smaller, and the male characters different. ‘The 
male has a moderately long narrow excision of the last ventral plate, and the segment 
preceding it slightly impressed, the impression not, however, extending to the hind 
margin, which is very slightly produced in the middle. 
The North-American 8. punctatus, Er., is very closely allied to S. alumnus, but has 
the punctuation of the terminal segments of the hind body coarser and the male 
characters different. 
Herr Hoge procured a good series at Mirador; these examples, though in bad preser- 
vation, appear to vary but little, and all have the antenne and legs flavescent. In | 
most of the specimens from Guatemala the club of the antennee is dark in colour, 
and the femora are darker testaceous externally. 
34. Stenus addendus. 
Nigro-ceneus, nitidus, tenuiter pubescens; antennis, palpis pedibusque testaceis ; dense fortiterque punctatus ; 
capite leviter bisulcato. 
Long. 33 millim. 
Hab. GuatEMALa, near the city (Champion); Panama, Tolé (Champion). 
Head unusually small, irregularly and rather finely punctate, the slight elevation 
separating the indistinct grooves glabrous and shining. ‘Thorax a good deal shorter 
than the elytra, much rounded at the sides. The male has a broad short excision of 
the last ventral plate. ‘Three examples. 
