词汇 | pronotum |
释义 | BETA Examples of pronotumpronotum isn’t in the Cambridge Dictionary yet. You can help! The wing femur and pronotum-depth head-width ratios were determined for locusts collected in 1930, 1931, 1932 and 1933. Pronotal collar hardly traceable, postero-lateral corners of pronotum evenly rounded. The dorsal spines of the comb are nearly as long as the ventral portion of the pronotum, while the lateral spines are quite short. Wing-pads reversed, pointing upwards and backwards and about three-quarters of the length of the pronotum. Wing-pads much longer than in previous stage, the length of the second pair exceeding that of the pronotum. In all the forms which have been found it is clearly marked except at the hinder end of the pronotum, where it fades most readily. The following table gives measurements of the length of the pronotum and femur for material taken from a number of swarms in the field. In the case both of males and females of "solitaria beginning to congregate " the pronotum is relatively very long compared with other types. Series (3) again shows some aberration from the other means for gregaria, the pronotum being somewhat less constricted. Pronotum strongly asperate posteriorly and with a deep strongly oblique sulcus on each side. Pronotum bright red, the pale bands present in the young form being entirely obliterated. In "solitaria beginning to congregate" the ratio is unity, while in the other series the width of the head exceeds that of the pronotum at its narrowest part. The lateral blotch of the pronotum becomes somewhat reduced in size during the early dissocians stages but only breaks up and fades away completely in the more extreme forms. In this series the pronotum of the male is apparently shortened to the same extent as in types from large swarms, while that of the female is relatively longer. In types of gregaria from very large and dense swarms the pronotum is relatively shorter than in other types, except in the case of the males of series (3). None of the transiens had a crested pronotum or two spots on the inside of the hind femur ; but several were found with hind tibiae of a reddish colour. Distinguished by the uneven granulation of the pronotum, the bare shiny frontal patch in the female, and especially the remarkable basal tooth on the hind femora of the male. Body length was the maximum length from the anterior margin of the pronotum to the posterior margin of the last tergum. |
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