510 COLEOPTERA. 



prolonged to the front, connecting stria normal. Elytra subquadrate. a 

 little narrowed near the shoulders, a third longer and broader than thorax, 

 without definite punctation ; sutural striae deep and broad, foveiform at 

 the base, the dorsal equally broad and deep but becoming shallow towards 

 the middle. Hind-body shorter than elytra, nearly as broad, basal three 

 segments subequal. Legs moderately stout ; tibiae somewhat arched 

 externally, the intermediate with a short stout calcar extending obliquely 

 inwards near the extremity. Female simple. 



Antennae as long as head and thorax ; basal joint short, but little 

 longer than the oblong-oval second, the next obconical, more slender than 

 the second but quite as long ; joints 4, 6, and 7 rather small, suboviform, 

 eighth shorter, fifth oblong-oval, distinctly longer than adjacent ones ; 

 ninth nearly twice as broad as its predecessor but not as large as the 

 penultimate, the terminal large, broader than tenth, subcorneal and acu- 

 minate. 



Underside concolorous, finely pubescent. Head with a subquadrate 

 basal fovea and a slender median carina. Prosternum longitudinally carinate. 

 Metasternum angularly impressed b(;hind. Second ventral segment larger 

 than third, both widely incurved and fringed with short brassy setae 

 behind, third curvedly depressed at each side of the middle, which, how- 

 ever, is subangulate there so as to partly cover the central depression of the 

 fourth, which is rounded behind in the middle ; fifth longer than fourth, 

 truncate behind in the middle, and with a broad central depression ; sixth 

 large, with a small but distinct basal impression, circularly emarginate 

 and enclosing the minutely and densely punctate seventh, which has a 

 narrow operculum. Trochanters spined. 



The type of the genus, P. spinifer (2476), is certainly the nearest species, 

 but it is of more parallel outline, it has longer antennae with more elongate 

 terminal joints, its eyes are more convex, the head is more obliquely 

 narrowed, the middle tibiae are more conspicuously calcarate, but the 

 remarkable abdominal structure is nearly the same. 



cJ. Length, 2 mm. ; breadth, f mm. 



Oakden, near Mount Algidus ; 23rd September, 1913. One of each sex 

 in a collection from Mr. Roderic Urquhart and Mr. T. Hall. 



4027. Plectomorphus collinus sp. nov. 



Small, nitid ; castaneo-rufous, antennae and legs paler, tarsi and palpi 

 testaceous ; pubescence yellow, somewhat curled. 



Antennae shorter than the head and thorax ; second joint oblong, as 

 long and stout as the basal, the next sUghtly longer than broad, narrowed 

 near its base ; joints 4-8 small, subquadrate, nearly alike ; ninth rather 

 larger than eighth but not as broad as the penultimate, eleventh large, 

 subconical, acuminate. 



Underside of head with upright greyish setae, most of these minutely 

 knobbed at the extremity ; its large basal fovea prolonged anteriorly. 

 Prosternum carinate along the middle. Metasternum unimpressed, convex. 

 Second ventral segment with numerous short brassy setae ; 3-5 widely 

 incurved behind, the third almost as long as the second ; sixth larger 

 than fifth, almost circularly emarginate and enclosing the large seventh. 

 Trochanters simple apparently. 



Fern. — Ventral segments 2-5 diminish, sixth large, simple. Head 

 broader. 



