The growth characteristics according to temperature conditions were investigated in the breeding room of the Sericulture & Entomology Experiment Station for Oriental garden crickets(Teleogryllus emma Ohmachi et Matsuura) and Modeagali-crickests(Loxoblemmus doenitzi Stein) collected from the lawns of Byeonsan-myeon, Buan-gun, Jeollabuk-do. The temperature conditions were 6 treatments from 15°C to 40°C at 5°C intervals using a multi-incubator, and the development period and mortality rate by age were compared using the 28°C breeding room conditions as a control. For T. emma, the higher the temperature, the shorter the total development period was, and the same trend was observed for the growth period by age stage. However, at low temperatures of 15°C and 20°C, all died after the third instar, and at high temperatures above 35°C, all died during development. At 25°C and 30°C, they developed normally, and the mortality rate was about 25%. The L. doenizi had the same tendency as the T. emma, with the higher the temperature, the shorter the development period. The total development period was 57.7 days at 25°C, which was similar to the T. emma's 55.9 days, and the mortality rate was the lowest at 44% at 25°C.

Sexual dimorphism, the difference between sexes in secondary sexual characters, is in general driven by processes of sexual selection. The horn-headed cricket, Loxoblemmus doenitzi, exhibits sexual dimorphism in head shape, in which males have flat heads and triangular horns on both sides of their heads, whereas females have rounded heads and no horns. We hypothesized that male horns have been evolved due to intra-sexual selection in which males use these horns as weapons in aggressive interactions. To test this hypothesis, we conducted agonistic trials of field-caught males in L.doenitzi. Horn length was significantly correlated with thorax length and hind femur length. During agonistic males aggressively used their horns by beating the opponent’s horns with their horns or by poking the opponent’s body with their horns. However, the result of logistic regression analysis revealed that horn length or horn point frequency were not significant factors for contest outcome. Instead, body size was significant for determining contest outcome

Three species are described in the genus Loxoblemmus (Orthoptera: Gryllidae) in the Repulbic of Korea: L. campester, L. equester, and L. doenitzi. Although males of L. doenitzi are characterized by triangluar-shaped horns on the face, these three species are generally difficult to distinguish based on morphological characteristics. Here, we compared males of L. doenitzi and L. campester collected from Mokpo and Jeju Island, using morphological, calling song, and DNA sequences data. In the tegminal characters that may be responsible for calling song production, harp and mirror areas were significantly different between L. doenitzi and L. campester, whereas there was no significant difference in the number of files. In the calling song characters, pulse number per chirp and peak amplitude were significantly different between L. doenitzi and L. campester, whereas pulse duration, pulse period, chirp period, and phrase period were not. The phylogenic tree analysis based on 16s ribosomal RNA gene sequence, the genetic distance between L. doenitzi and L. campester was very close (0.1-0.15), suggesting that these two species recently diverged from the common ancestor.