124 
PROCEEDINGS OF SOCIETIES. 
Ord. Diptera. —Fam. Muscid.®. —Trib. Ephydrini. 
Discomyza cimiciformis (Ct. Mss.)— Obscure cenea , antennarum basi tarsisque 
ferrugineis , halteribus fuscis , alarum venula discali oblique jlexa. Long. 1; alar. 
2 lin. 
Not one-fourth the size of D. incurva. Dark brassy. Head rugose, with smooth 
blackish frontal fillets. Second joint of antennae ferruginous, dusky at the tip; 
third oblong, dusky. Thorax finely scratched transversely, and pubescent. Ab¬ 
domen smooth and glossy, the 4th segment much enlarged in the male. Legs 
black; tarsi, except the last joint, ferruginous. Wings sooty, lighter behind. 
Veins strong, blackish; radial vein, from end of subcostal, almost contiguous to 
the costal, but distinct at the end, which is but little farther from the cubital than 
this from the subapical; last segment of pobrachial about as long as the discal 
veinlet, which is bent obliquely, making a very acute angle with the prsebrachial 
vein. 
Pelina cenescens , Stenh. Eph. 210, 13(1844); Ztt. D, Sc.— cenea , Ztt. Ins. Lap. 
— Nigro-cenea hypostomate albicante , venula discali et abscissa pobrachiali 
extrema cequilongis ) tar sis nigricantibus. Var. tar sis flavicantibus. Long. 1; 
al. 2| lin. 
Smaller and more slender than P. cenea, darker and more glossy, without the 
coppery lines of the mesonotum, the face whiter, and the cheeks narrower. But 
the most obvious difference is the greater distance of the transverse discal veinlet 
from the margin, leaving the last segment of the pobrachial vein about as long as 
itself. 
Mr. Hogan showed specimens of the (presumed) larvae of Diglossa mersa , pre¬ 
served in spirits.* These were found on the sea-coast, at Baldoyle and Dingle 
Bay, under stones, in company with the perfect insects, but are later than these in 
their yearly time of appearance, not having been observed earlier than the end of 
July. They resemble each other in their movements, quick and jerking ; and there 
is an obvious analogy in the form of the mandibulae, &c., as shown in the figures 
given in the present number. 
The meeting then adjourned. 
REFERENCES TO PLATE III. 
Fig. 1. Ochthebius rufomarginatus, Erichson; Thomson.— O. bicolor 
var., Mulsant; Fn.Fr. 
Fig. 2. Cercyon depressum, Stephens.— C. dor so-striatum , Thomson.— C. 
Head.— Q.' Lateral outline of Prothorax.—T/ Fore Tibia with Tarsus.—K. Me- 
sosternum and Metasternum. 
Fig. 3. Ochthebius punctatus, Larva.—B. Antenna. M' Mandibula.—-M. 
Maxilla.— L/ Labrum_L. Labium.—P" Labial Palpus. 
Fig. 4. Diglossa mersa, Larva ; like references. 
Fig. 5. Ptilium coarctatum. 
Fig. 6. Ptilium clandestinum. 
Fig. 7. Trichopteryx mollis. —B. Antenna, g. Underside of Pterothorax 
with Abdomen. 
* Figured, PI. iii., fig. 4. 
