266 SUPPLEMENT. 
anything similar to it among the Lampyride before. The antenne are compressed 
and not unlike those of a Lucidota, such as L. tincta, with which I at first associated 
the species, and which it resembles in colour, but they are very much shorter, and it 
appears to me that this very curious species is allied to P. exstinctus, and that possibly 
they are forms requiring a new genus; but a close examination of that species (of which 
I had ‘formerly seen only female examples), although I have detected males, does not 
reveal any such remarkable appendages as we have here. The males would not appear 
to be highly luminous, the seventh segment only being a little paler than the rest of 
the abdomen, while the female has two pale spots, one on each side of the apical 
segment, which are clearly the light-giving parts. 
Fortunately a male and a female were transmitted, united im copuld, on one card 
from Bugaba, from which I have drawn the diagnosis. In some of the specimens from 
the higher altitudes of the Volcan de Chiriqui the margins of the elytra are white as 
in Z. comitata, but in the types they are of the same black tint with the elytra. So 
many species are coloured in the same way that comparative characters based on colour 
alone would be only misguiding. ‘The width of the antennz would lead one to place 
the insect in Lucidota; I prefer to retain it here, as being allied to P. exstinctus, 
P. sobrinus, and P. nigricans, Say. From Lucidota tincta, with which it might be 
otherwise confounded, in addition to the genital armature, the proportional shortness 
of the antenne will separate it. Their joints from 3-8 are about half as long again as 
wide, hardly more produced at their angles internally than externally, so that they are 
not serrate, nor do they differ in the sexes; joint 10 is as long as but narrower than the 
preceding one, white, or infuscate at its base only; joint 11 is much smaller in the 
female, but as long though narrower in the male and entirely white. At present I have 
found about six specimens from each locality which I refer to this species. 
25 (a). Photinus diurnus. 
Oblongo-elongatus, subparallelus, nigro-fuscus, parum nitidus ; prothorace disco nitido, basi impresso, margine 
frontali et laterali pallido, elytrorum limbo toto basi excepta, pedibusque basi pallidis. Long. 6—7 millim. 
SQ. 
Hab. Panama, Volcan de Chiriqui (Champion). 
This insect is closely allied to P. fumigatus, and might perhaps be considered a 
local form of that species ; nevertheless the whole series of several hundred specimens 
collected by Mr. Champion at the altitude of 2500 to 4000 feet differ from that species, 
which is common at lower altitudes, in being more parallel and much narrower. It is, 
like P. fumigatus, either non-luminous or very slightly so, judging by the abdominal 
segments, which are only infuscate towards the sides and apex in either sex. The 
thorax is more uniformly dark all over the disc than in P. fumigatus, in which species 
the sides of the disc have often a deep red spot. There is very little doubt that it is a 
day-flying species. 
