サイカブト (Xyloryctes thestalus) Rhinoceros Beetle

Family科：Scarabaeidae (Scarab Beetles)

Subfamily亜科：Dynastinae (Rhinoceros Beetles)

Tribe族：Oryctini

Genus属：Xyloryctes (Rhinoceros Beetles)

Species種：thestalus (Xyloryctes thestalus)

• りんごの皮。長生き。休まず歩き回っている。
• 本種とXyloryctes Jamaicensis Druryの違いについて調べること。
• 幼虫は腐った木とか腐敗の進んだ藁とかを食べると以下レポートにもあるが、交尾や産卵を確認できず。
• 来年の対応：Arizona Ash探し：公園や公共施設。不動産物件。木肌に見覚えあり。

参考論文：

以下Journal of the Kansas Entomological Society ~ 1983 Kansas (Central States) Entomological Societyからの抜粋；

要約: Third stage larvae of the rhinoceros beetle, Xyloryctes Jamaicensis Drury (Coleoptcra, Scarabaeidae), were abundant during autumn 1981 in litter and upper soil horizons of a bur oak-hackberry forest near Manhattan, Kansas. Densities of larvae ranged from 0 to 3.7 individuals/m2 within forest transects, while amounts of fecal pellets of these larvae ranged from 28.2 to 463.1 g/m2 along these same transects. No third stage larvae were present the following autumn, suggesting that the population is dominated by a particular brood. Fecal pellets exhibited slow decay rates (l0%/yr), and the amount of pellets on the forest Boor represents the relative abundance of several generations of larvae.

The rhinoceros beetle, Xyloryctes jamaicensis Drury, is reported to be a locally abundant scarab in cenain northeastern deciduous forests, and has been observed as far west as Arizona (Ritcher, 1966). The larvae feed on rotting wood and well
decayed litter, although Borror et al. (1976) stated that the larvae also feed on roots. Reports of this species in Kansas are limited Several specimens from RileyCounty, Kansas, are housed in the Kausas State Entomology Museum, but no specimens from Kansas are contained in the Snow Entomological Museum at the University of Kansas (W. Morrow, pers. comm). The large size of the adults (about 25 mm), along with the conspicuous "horn" of the male, makes this insect attractive to collectors. Thus, this insect was probably uncommon in the riparian forests of eastern Kansas.

A population of larvae of X. jamaicensis was discovered during a preliminary survey of forest floor detritivores of Kansas riparian forests. This report documents densities of larvae, as well as the amount and decomposition rate of larval fecal pellets found on the forest floor.

Methods

Sampling was conducted in bur oak-hackberry forests in the Kings Creek drainage of Konza Prairie Research Natural Area, about 22 km south of Manhattan, Kansas. The composition and extent of these riparian forests have been described
by Gurtz et al. (1982). Larvae were censused in October 1981 by sieving litter and humus taken from 0.25 m2 quadrats at sites selected randomly along 5 transects. Larvae obtained during sieving were taken to the laboratory and fed various types of decaying plant materials (senescent leaves, decaying wood and humus) to ascertain food habits.

参考url：
http://www.naturesongs.com/vvplants/azash.html
http://bugguide.net/node/view/345795