天牛科新种记述

本文记述天牛科新种十种,属于花天牛亚科的二种,天牛亚科的三种,沟胫天牛亚科的五种。新种模式标本存放地点,除在新种下注明的而外,均存西南农学院植保系。 花天牛亚科 x纹筒花天牛Encyclops x-signata Chiang新种(图版I:1) 雄虫 体型狭长,两侧平行,近圆筒形。全体茶褐色,被极薄的灰黄色绒毛;鞘翅背中央各有一淡黄褐色大形半环纹,左右相合成“X”纹,翅基部五分之一处各有一同色的斜弧纹,其后端左右相接,沿中缝下伸与“X”纹的中间相连,翅端部五分之一处淡黄褐色,斑纹之间的部分茶褐色较深暗。     

中国脊花天牛属一新种(鞘翅目: 天牛科)

记述中国花天牛亚科1新种--裂跗脊花天牛Stenoconus schizotarsus, sp. nov., 模式标本存西南农业大学昆虫标本馆.     

中国沟胫天牛亚科一新属及一新种（鞘翅目：天牛科）

本文记述天牛科沟胫天牛亚科１新属，球胸天牛属Ｇｉｂｂｏｈａｍｍｕｓｇｅｎ．ｎｏｖ．和１新种：缩颈球胸天牛Ｇｉｂｂｏｈａｍｍｕｓｓｔｒｉｃｔｉｃｏｌｌｉｓｓｐ．ｎｏｖ。     

Development-activity relationships in nymphal corpora allata of the cockroach, Diploptera punctata

Abstract. In females of Diploptera punctata the corpora allata undergo a gradual increase in volume during most of the second nymphal stadium. In the first half of the stadium, steady growth of the glands results from a progressive increase in the size of constituent cells. Late in the stadium, cell size declines but the volume of the glands continues to rise due to an increase in cell number. Changes in cell size during the stadium displayed a distinct pattern in relation to Juvenile Hormone (JH) synthesis. Both cell size and activity increased during the first two-thirds of the stadium, peaked early in the last third of the stadium, and decreased before the moult. The rise in cell numbers late in the stadium corresponded to a wave of cellular mitosis and occurred after a steep decline in the rate of JH biosynthesis. Exposure of late second instars to fenoxycarb. a JH analogue, depressed mitosis significantly, suggesting autocrine regulation of cell proliferation in the corpora allata. Possible mechanisms modulating sequential cycles of growth and atrophy of cells and cell proliferation in these glands are discussed in relation to temporal patterns of JH and ecdysteroid titres in nymphs.