386 ENTOMOLOGICAL NEWS [Nov., '13 



tive of whether they were made up of two or more individuals. 

 The latter species is the one formerly known as Cycloneda 

 oculata Fab., a variety of abdominalis before Casey removed 

 it from the genus Cycloneda and placed it in the genus Olla. 



■Colonel Casey, in his revision of the Coccinellidae, states 

 that the large series of Olla abdominalis studied by him ex- 

 hibited an extremely small amount of variation, which, con- 

 sidering its geographical range, is very remarkable. The fol- 

 lowing descriptive notes are taken from his diagnosis of the 

 species : 



Upper surface pale brownish-yellow, head pale and immaculate. 

 Pronotum with a basal black spot at two-fifths from the middle and 

 a short transverse spot before the scutellum, also with two pos- 

 teriorly converging black spots at the center and a narrow elongate 

 spot on the median line joining the ante-scutellar spot and, at lateral 

 eighth and basal third, a small rounded spot. Scutellum black in the 

 male. Elytra each with a subbasal transverse series of four small black 

 spots, a median series of three spots, the medial the largest and trans- 

 versely crescentiform and, at apical fourth near the margin, another 

 small rounded black spot. Legs and under surface pale. 



After a careful study of the series under consideration, 

 thirty-one specimens were selected out of the two hundred 

 and arranged so that at one extreme they tended toward 

 albinism and at the other toward melanism. By selecting and 

 classifying the variations in elytral maculation, it was pos- 

 sible to arrange them in ten series, as follows : 



Series I, fig. 1. — Subbasal transverse series of elytral maculae small 

 and subequal ; median* macula of the median series obsolete, the 

 medial and lateral maculae larger than those of the subbasal series, 

 the medial scarcely crescentiform; subapical macula very minute. 

 Pronotal maculae all rather widely separated, lateral macula minute. 

 Scutellum and sutural margins of the elytra pale. Under surface 

 and legs rufo-testaceous, except the metasternum, which is rufous, 

 and the meso- and met-episterna which are distinctively whitish, the 

 small epimera apparently concolorous. 



A companion specimen to the one from which fig. 1 was drawn, is 

 identical with the above, but the meso- and met-episterna are white, 

 the mes-epimera apparently rufo-fuscous, and the met-epimera are 

 white; the metasternum rufous, laterally rufo-piceous, the first two 



*Note. — The adjectival terms lateral, median and medial refer to 

 the maculae in a series on each elytron. 



