AS. | MALACODERMATA. 
its sides are always more or less whitish (in my types of minutus the red predominates) ; 
the abdomen is whitish ; the antenne are longer, reaching to about the fourth seg- 
ment of the abdomen, or in male specimens even further. In some specimens there is 
an oblong impression on the disk of the thorax, but it 1s not channelled. 
81. Photinus picticollis. 
Nigro-fumosus, prothorace nitido, disco nigro-vittato utrinque macula sanguinea, margine fusco alboque varie- 
gato; femoribus anterioribus basi subalbidis. Long. 8-93 millim. ¢ @. 
Mas oculis majoribus, abdominis segmentis quinto et sexto albis vel flavis, eburatis, medio sinuatim emargi- 
natis, subapicali brevi albo, pygidio apice fusco. 
Femina abdomine fusco, segmento quinto subdiaphano sordide albo. 
Hab. Guatemaa, San Gerénimo, Chiacam (Champion). 
Although this species presents a superficial resemblance to P. californicus, the 
white luminous abdominal segments of the male remove it to another section, it 
being, in fact, as I think, allied to species of the extensus group. 
The thorax is more vividly marked with carmine or blood-red than that of P. 
sobrinus, but is not margined so distinctly with black, the white and fuscous running 
into each other. The disk is usually somewhat tumid on each side of a short groove, 
and has often two or four tubercular swellings there. In front and at the sides it is 
punctured very closely and subrugosely. The elytra are quite sooty black. This 
species must be highly luminous, at all events in the male sex; and accordingly we 
find the eyes of that sex very large and spherical, much more so than in the other 
small Photini, which, though luminous, have not these ivory-white long fifth and 
sixth ventral plates in the males. 
32. Photinus exstinctus. 
Lucidota exstincta, Gorham, Trans. Ent. Soc. 1880, p. 17. 
Hab. Mexico, San Luis Potosi (Dr. Palmer), Cordova, Oaxaca (Sallé) ; GUATEMALA, 
near the city, Duefias, San Gerénimo (Champion). 
This species and the following one were at first referred by me to Lucidota, with 
some species of which they have some affinity; but they are so closely allied to 
nigricans, Say, a species found in the United States, that it will be better to place them 
here at present. Indeed this species is named “ nigricans, Say,” in Sallé’s collection ; 
but the representatives of that species, which I have received from Massachusetts, have 
the sides of the thorax of the same dark fuscous colour as the disk, whereas among a 
good series taken by Mr. Champion, and another in Sallé’s collection, none is even 
inclining to be dark. I therefore still think it will prove distinct. 
This is one of those few species occurring in various genera which apparently have 
no portion of the body translucent, and are therefore presumably not luminous; the 
supposition, however, requires confirmation by observation of the living insect. 
