Hatching behaviors of the desert locust Schistocerca gregaria (Forskal) (Orthoptera: Acrididae) and the Bombay locust Nomadacris succincta (Johannson 1763) (Orthoptera: Acrididae) were observed to analyze the mechanisms controlling the hatching time and synchrony. At a 12-h thermoperiod of 25 °C and 30 °C under continuous illumination, most eggs hatched during the low temperature period in the desert locust, and the proportion of such individuals was lower in eggs kept in a mass than in those kept singly. In the Bombay locust, most eggs hatched during the high temperature period; however, the inter-pod variation was large. Both locusts hatched earlier with increasing the egg mass size in a range from 2 to 10 or 20 with similar hatching intervals. Desert locust eggs from different pods advanced the hatching but did not delay it to synchronize the hatching. In contrast, Bombay locust eggs advanced or delayed hatching depending on the age of the paired egg. The results suggested the presence of embryo–embryo interactions. In both locusts, a vibrational stimulus that was emitted by the embryo and transmitted via a piece of wire was likely to be responsible for synchronized hatching. The hatching patters of these species were compared with those reported previously for other taxa.

中文翻译：

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沙漠蝗 Schistocerca gregaria 和孟买蝗 Nomadacris succincta（直翅目：蝗科）孵化时间和同步控制机制的比较

观察沙漠蝗 Schistocerca gregaria (Forskal) (Orthoptera: Acrididae) 和孟买蝗 Nomadacris succincta (Johannson 1763) (Orthoptera: Acrididae) 的孵化行为来分析控制孵化时间和同步性的机制。在25°C和30°C连续光照下12-h温期，沙漠蝗虫卵大部分在低温期孵化，而这些个体的比例在成群饲养的情况下低于单独饲养的个体。 . 在孟买蝗虫中，大部分卵在高温期孵化；然而，豆荚间的差异很大。两种蝗虫的孵化时间都较早，卵的质量在 2 到 10 或 20 的范围内增加，孵化间隔相似。来自不同豆荚的沙漠蝗虫卵提前孵化，但没有延迟孵化以同步孵化。相比之下，孟买蝗虫卵根据配对卵的年龄提前或延迟孵化。结果表明存在胚胎-胚胎相互作用。在这两种蝗虫中，胚胎发出并通过一根电线传输的振动刺激很可能是同步孵化的原因。这些物种的孵化模式与之前报道的其他分类群的孵化模式进行了比较。胚胎发出并通过一根电线传输的振动刺激可能是同步孵化的原因。这些物种的孵化模式与之前报道的其他分类群的孵化模式进行了比较。胚胎发出并通过一根电线传输的振动刺激可能是同步孵化的原因。这些物种的孵化模式与之前报道的其他分类群的孵化模式进行了比较。