Alurnus costalis Rosenberg 1898

Staines, C. L., 2013, A review of the genus Alurnus Fabricius, 1775 (Coleoptera: Chrysomelidae: Cassidinae), Insecta Mundi 2013 (291), pp. 1-34 : 9-10

Alurnus costalis Rosenberg 1898 ( Figure 6)

Alurnus costalis Rosenberg 1898: 93 [holotype: R. Dagua, Colombia, W. Rosenberg/ F. C. Bowditch Coll./ A. costalis Rosenberg type/ M.C.Z. type 25814 (red label) (MCZC)]. Donckier 1899: 613 (catalog); Weise 1910: 103 (key), 1911a: 13 (catalog), 1911b: 19 (catalog); Campos 1921: 96 (faunal list); Fischer 1935: 268 (revision); Blackwelder 1946: 721 (faunal list); Papp 1953: 31 (catalog); Uhmann 1957a: 37 (catalog).

Alurnus costalis bipartita Pic 1926: 9 [type: Ecuador (MNHN)]. Pic 1934b: 8 (noted); Fischer 1935: 268 (revision); Blackwelder 1946: 721 (faunal list); Uhmann 1957a: 37 (catalog); Descarpentries and Villiers 1959: 142 (types).

Alurnus costalis niger Pic. Zoological Record 1926: 238 [nomen nudum]. Blackwelder 1946: 721 (faunal list).

Description. Head, antenna, pronotum, scutellum, legs, and venter black; elytra ochre-yellow in basal half, reddish in apical half. Head: vertex punctate, setose, medial sulcus present, not depressed between eyes; front punctate; clypeus punctate with fringe of setae apically. Antenna: antennomere 1 elongate, expanding apically, longer than 2; 2 cylindrical, very short; 3 length 3x length of 4; 4-5 cylindrical, subequal in length, each 0.33x length of 3; 6-10 decreasing in length; 11 longer than 10; punctate, each puncture with pale seta. Pronotum: transverse; lateral margin sinuate, anterior angle acute; posterior angle with large obtuse tooth; disc slightly depressed apically; surface rugosely punctate; deeply depressed; densely covered with gray setae; pronotal length 5-6 mm; pronotal width 6-7 mm. Scutellum: cordate; coarsely punctate. Elytra: margined laterally and apically; sutural angle acute, without tooth; humerus rounded, produced; sinuate behind humerus; with six well-developed costae, tending to converge and unite apically- costa 1 on suture, entire; 2 confluent with 1 at base, then diverging for one-fifth elytral length, then joining 1 again; 3 at base confluent with 1 and 2, then diverging, then parallel to suture to apex; 4 weak from base to humerus, then prominent; 5 beginning after humerus, continuing to apical quarter; 6 along lateral margin at base; area between costae densely punctate, more coarsely at base, occasional punctures on costae; elytral width 12-14 mm; elytral length 25-31 mm. Leg: punctate, each puncture with pale seta. Venter: punctate, each puncture with pale seta; abdominal sterna 3-4 pustulate laterally. Total length: 33-38 mm.

Larval host plant. Unknown.

Distribution. Colombia, Ecuador.

Specimens examined. Colombia. Nariño: R. N. La Planada, Parcela Olga, 16.vii-2.viii.2000, 1850 m, 1 o 15’N 78 o 15’W ( IAVH, 1). Valle: Colima Valley , 14.iv.1983 ( CMNH) . Ecuador. No further data ( USNM, 1). Cachabí: low c., i.97 ( USNM, 1) ; Cachabí to Paramba, ii.97 ( USNM, 1). Total: 5 .